How Heath Row became Heathrow

How Heath Row became Heathrow

This brief overview looks at the history of Heathrow and the area on which it was built with the aid of four historical Ordnance Survey maps. In each case the present-day airport (pale pink) and the proposed expansion (pink) have been superimposed.

In May 2010, the new coalition government announced that the most recent plans for the expansion of Heathrow Airport, which both parties had opposed when in opposition, would be cancelled.

These bald facts conceal the story of how Heathrow was conceived by deception, born into uncertain times and yet grew into what is now the busiest international airport in the world. With the aid of a series of maps of the area, this article explores this unlikely


Extract taken from Cassini Old Series  176 – West London (1805 – 1822)

This map was created from Britain’s first national mapping project, Ordnance Survey’s One-Inch (‘Old Series’) maps which were first published between 1805 and 1874. They have all been carefully scanned, digitally re-projected and enlarged to match the present-day Ordnance Survey Landranger® series.

The land Heathrow occupies today is in the southern part of the London Borough of Hillingdon although historically it covers two of the ancient Middlesex parishes of Harlington and Harmondsworth. Domestic settlement in the area probably dates back to 500BC and a Roman camp existed on the site now occupied by the airport. The proximity to the major east-west route of the Bath Road (now the A4) doubtless influenced the development of all the villages and hamlets in the parish. Heath Row, as it was then known, was first mentioned by name in documents from around 1410.

The parish mainly comprised flat fields that were irrigated, and at times flooded, by several waterways that drained into the River Colne. Two of these, the Duke of Northumberland’s River and the Longford River, were artificial. The former was constructed in the 1530s to provide additional power for Isleworth Mill, the latter in the 1630s to improve the water supply to Hampton Court. The subsequent development, if so it can be called, of the parish was little more than the gradual increase of cultivated land centred on a few small hamlets.

The Ordnance Survey maps pick up the story in the early 19th century. As a study of other maps from this period will show (and those of the whole country are available from the British landscape in the early and mid 19th century was typified by small farms and small villages, interspersed with woods and open countryside and linked by a network of ancient roads and tracks. The area around Heath Row was no exception.

In the late 19th century, orchards and market gardens began to replace arable land and some new buildings were constructed, but in general the character of the area altered very little. This was about to change.


Extract taken from Cassini Revised New Series 176 – West London (1897-1909)

This map was created from Ordnance Survey’s Revised New Series (in colour) maps which were first published between 1896 and 1909. They have all been carefully scanned, digitally re-projected and enlarged to match the present-day Ordnance Survey Landranger® series. 

This map was created from Ordnance Survey’s Revised New Series (in colour) maps which were first published between 1896 and 1909. They have all been carefully scanned, digitally re-projected and enlarged to match the present-day Ordnance Survey Landranger® series

Heathrow’s aviation history goes back to the First World War when the site was used as a military airfield, although little evidence remained by the time of the Popular Edition map of 1920. In this year the airport was closed for various logistical reasons including bad communication, the bumpy nature of the ground, its tendency to become boggy and muddy in winter and its frequent covering of mist. As the map showing the current expanse of the airport shows, these problems have since been overcome.

In the late 1920s the Colnbrook by-pass was opened which led increased industrial development in the area. One result was the re-opening of the airfield, as the Great Western Aerodrome, by Fairey Aviation as a centre for aircraft assembly and testing.

It had become clear by the 1930s that civil aviation would increase (though few would have predicted by how much), and the government began to make provision for the capital’s air services. The plan was to expand the two existing aerodromes at Croydon and at Heston, to the east of modern-day Heathrow, and to add two new ones, at Fairlop in Essex and Lullingstone in Kent. Heathrow’s flat terrain, proximity to London, good communications and comparative lack of housing must already have made this an attractive candidate for expansion, despite its other disadvantages. Work was under way on all these projects when war was declared in September 1939.


Extract taken from Cassini Popular Edition  176 – West London (1920)

This map was created from Ordnance Survey’s Popular Edition maps which were first published between 1919 and 1926. They have all been carefully scanned, digitally re-projected and enlarged to match the present-day Ordnance Survey Landranger® series.

It can be seen from the three preceding maps that the area of Heath Row experienced various, largely undramatic, changes during the 19th and early 20th centuries. Although most of the settlements expanded only slowly, the character of the area was starting to reflect the growth of nearby London: the increased cultivation, the railways, the growth of East Bedfont (and the creation of its school), the emergence of Southville and the construction of the Staines Reservoir all show the area’s increased importance as a supplier of goods, services and labour to the vast metropolis that was expanding towards it at an alarming rate.

In late 1942, there was increasing demand from the Air Ministry for a base for the new long-range heavy troop-carrying planes, existing facilities in the south of England being inadequate. After some debate, this slightly boggy area of market-garden farms was chosen as the site of a wholly new airfield. Construction work began in May 1944 on land originally acquired from the vicar of Harmondsworth. Although the location was ideal, the terrain was not. 100 million gallons of water had to be pumped out of the ponds and 14 miles of pipes were needed to drain rainwater into a nearby gravel pit. Another task was the clearance and demolition of the hamlet of Heath Row. Few other places have become so posthumously famous.

At the time, the Air Ministry’s case must have seemed unanswerable, but doubts exist as to whether there was ever any intention to use Heathrow for military purposes. The fortunes of war were shifting in the Allies’ favour, so making large-scale troop movements by air less likely; whilst the argument for a large new civil aerodrome was clear to those who were considering how post-war Britain might be shaped. Due largely to wartime innovations, aircraft were now far bigger. Commercial air travel before the war was still a novelty – when Prime Minister Neville Chamberlain left nearby Heston Aerodrome for the first of his ill-fated meetings with Hitler in 1938 it was the first time he had been in a plane, which excited little comment at the time – but demand seemed likely to increase substantially in the future. The 1930s plan of four small airports around the capital was now inadequate. Instead, the contemporary logic ran, one larger hub was needed which could be purpose-built for the new aircraft and would be capable of future expansion as the need arose.

The main problem was that any civil project on this scale would have led to protracted planning enquiries and divisive financial wrangles within Whitehall. Using wartime powers to requisition the land offered a more certain outcome. The then Parliamentary Under-Secretary Harold Balfour later admitted that he had misled the cabinet on this point in order to expedite the process. Were military use the only requirement, many existing RAF bases could have been converted with far less time and effort. Whatever the real motives, Heathrow was allowed to slip into being almost unnoticed, in marked contrast to the glare of publicity which attended many of its later developments. Heathrow would not have been the first project by a national government promoted under the guise of military exigency, and is unlikely to be the last.

In the event this potential conflict of interests and purpose never materialised, for construction was still not complete by the end of the war. The military origins of the project were quietly forgotten and work continued on building what was now unambiguously a civilian airport. This was officially opened in May 1946 with a flight to Buenos Aires via Lisbon, the departing passengers enjoying terminal facilities that consisted of little more than a large tent. At the time, Heathrow’s managers stated, with rare prescience, that it would eventually become the largest airport in the world.
heathrowPlaneThe next few years did little to justify this optimism. Numerous problems were encountered with the construction of terminal buildings and the second runway, not helped by post-war restrictions in obtaining suitable materials. As late as mid-1948, Northolt (which Heathrow was intended to supersede) was actually handling more travellers. Yet all these problems were eventually overcome. In 1953, Heathrow handled a million passengers (about the number of people that used it every five days in 2010), and this had increased to 20 million by 1973. Now it is the world’s busiest international airport with over 61 million international travellers in 2010 (roughly the population of the UK) and is the daily workplace of over 76,000 people (roughly the population of Basingstoke). It is the largest single-site employer in the country. Other statistics are more bizarre, though perhaps in their own way no less revealing. 10% of the UK’s perfume sales are made at the airport; a bottle of whisky is sold there every seven seconds; the annual turnover of Heathrow’s shops (about half a billion pounds) is more than the entire GDP of American Samoa.

In January 2009 the then Labour Government gave the go-ahead for a third runway and a sixth terminal at Heathrow. The announcement followed several years of lobbying and planning by interested parties which had begun even before Terminal 5 had been completed. The result would have been to increase the annual number of flights from 480,000 to 700,000 and would have required the demolition of 700 homes in the borough of Hillingdon, including all of the ancient village of Sipson and parts of Harmondsworth and Harlington. The decision was not met with unanimous public approval.

The debate about expansion rumbled on until the 2010 general election, involving almost every major organisation in British public life. The advocates of the third runway and the sixth terminal – which included the Labour government, the BAA, British Airways, the CBI, the TUC and the British Chamber of Commerce – argued that expansion was essential and that the economic benefits to the UK’s economy would be in the region of £7 billion a year. The opponents – which included the Conservatives, the Liberal Democrats, the Mayor of London and his predecessor, Hillingdon Council, environmental campaign groups, residents’ associations, aid agencies, the National Trust, the RSPB and the local Labour MP – questioned whether the financial benefits (if realised) would outweigh the negative factors of disruption, pollution and noise.

In the event, the new coalition government acted swiftly. Within days of the election it announced that the plans for the expansion were to be shelved. The problem was solved – for now.

The history of Heathrow does not, however, suggest that the airport will stay out of the limelight for long. Opinions differ as to whether southeast England needs more airport capacity and, if so, where it should be situated. Future expansion plans cannot be ruled out. Heathrow seems set to be at the heart of the debates about the future of transport, development, environmental issues and government policy for many years to come. Expect more enquiries, more protests and more statistics: further blazes of publicity, in short, in contrast to the furtive way in which the airport came into being sixty-odd years ago.


Extract taken from Cassini New Popular Edition  (1945)

This map was created from Ordnance Survey’s New Popular Edition maps which were first published between 1945 and 1946. They have all been carefully scanned, digitally re-projected and enlarged to match the present-day Ordnance Survey Landranger® series.

Start discovering the landscape of the past for yourself. Every corner of England, Scotland & Wales is covered with a range of old maps dating from the late 1600’s to the Present day. Visit Cassini Maps

Map of the week – World adopts Greenwich Mean Time

Greenwich meridian chosen as the official prime meridian.

From the 17th century onwards Greenwich, home to the national observatory, had been the centre for the study of time as well as the skies, the link being the need for accurate timekeeping for navigation. Accordingly, a meridian at the Greenwich Observatory(originally the site of Greenwich Castle, constructed by the Duke of Gloucester, in 1433) was set, by the British, as the zero point of reference for determining time and longitude.

Greenwich Mean Time was first adopted across the island of Great Britain by the Railway Clearing House in 1847 to standardise train timetables, and by almost all railway companies by the following year. By the end of 1880 GMT had been legally adopted throughout the island of Great Britain.

In 1884 the US Government called a conference to determine a standard for world time keeping. After deliberation the Washington conference decided on the meridian at Greenwich as the reference point. Forty-one delegates from 25 nations met and by the end of the conference, Greenwich had won the prize of Longitude 0º by a vote of 22 in favour to 1 against (San Domingo), with two abstentions (France and Brazil).
Cassini downloadable maps – Site Centred

Whatever your interest in the past our historical maps are invaluable works of reference. Ideal for reasearch, or print and frame for a personalised decorative map centred on the location of your choice.

Find downloadable maps of your area at Cassini Maps!

Map of the week – Bournemouth 1811

Map of the week – Bournemouth 1811

Ordnance Survey Old Series 1:50,000  (and present day OS 1:50,000)

At the start of the 19th century the area was largely a remote and barren heathland, used only by smugglers and revenue troops.

A man called Tregonwell is regarded as the first inhabitant of Bournemouth. In 1810 he visited the beach with his wife. She loved the area and persuaded him to build the first house. By 1840 a small village had sprung up. By 1851 Bournemouth was still a little village with a population of only 695, but it was growing rapidly and by 1861 the population had grown to 1,707.

The railway reached Bournemouth in 1870, which caused the town to boom. By 1881 the population of Bournemouth stood at 16,859. Ten years later it reached 37,000.

In two hundred years Bournemouth has grown from Tregonwell’s single house to a population of 183,491 making it the largest settlement in Dorset. With Poole to the west and Christchurch in the east, Bournemouth forms the South East Dorset conurbation, which has a total population of over 400,000.

Find maps of your area.

Cassini map of the week – Guildford 1816

Cassini’s map of the week – Guildford


Guildford 1816 Ordnance Survey Old Series

Ever wondered why Guildford developed in the location seen today? By referring to the Cassini Old Series maps it can be seen how Guildford, the county town of Surrey, developed in a gap in the North Downs, through which the River Wey passes. Any traveller in Surrey heading from North to South, or vice versa, would make straight for the gap in the chalk hills rather than climbing the the escarpments of the downs.

Before the advent of contour lines each hand drawn Ordnance Survey map indicated the relief of the land with hatchuring (from the Old French word hacher, to cross hatch) making it clearly visible how the landscape played a vital role in the positioning and settlement of cities, towns and villages across the length and breadth Britain.

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New Sheet Map of London is a first!

New Sheet Map of London

New Sheet Map of London is the first to take advantage of the “Free our Data Campaign” and Ordnance Survey’s recent relaxation in licensing policies.

Cassini Maps has launched a new folded sheet map of London using Ordnance Survey data at 1:50,000 scale.


One may initially think, “so what? Another map of London?”

However the story behind this seemingly unremarkable occurrence shows it is rather more than that…

The Ordnance Survey Landrangers at 1:50,000 scale, often referred to as the pink maps (unsurprisingly, due to their distinctive pink covers), have provided the definitive coverage of Great Britain since the 1970s. It’s probably true that a vast proportion of UK households contain one Landranger, somewhere on a shelf or in a rucksack.

These are derived from a seamless digital map of Great Britain that is chopped into manageable 40km x 40km chunks and printed on a series of large sheets – 204, to be exact.

The problem with chopping the country up in this way is that there are going to be towns or cities that fall across a join. Norwich, Swansea, Sheffield and Ordnance Survey’s home city of Southampton all suffer from this problem to some degree. But nowhere suffers as badly as London.

The capital is split across two Landrangers, 176 (West London) and 177 (East London) with a considerable overlap. It’s not known why this seemingly odd decision was taken; but once made, Ordnance Survey did not re-adjust the coverage, despite the fact that the whole of London more or less up to the M25 can be accommodated on one Landranger-size sheet.

This is the problem that Cassini has solved with its new London map using Ordnance Survey 1:50,000 mapping data.

“This problem struck us when we preparing our boxed set of historical Ordnance Survey maps of London in 2007,” Cassini’s Cartographic Director James Anderson recalls. “We’d already spent three years scanning and combining historical maps to match the Landranger sheets and people had to buy twice as many maps as they really needed to cover the whole of London. So, we decided to create a set of historical maps centred on Charing Cross.”

Five such maps of the city having been created, the logical step was to produce a matching present-day one. “Unfortunately,” Anderson recalls, “Ordnance Survey’s licensing policy at that time prohibited anything other than one-off reproduction of this data at larger than A3 size. Somewhat to our surprise, and much to our disappointment, we were therefore unable to proceed. We were convinced there was a demand for this, both as a stand-alone and as part of our London map set; but, as matters stood, nobody but Ordnance Survey could satisfy it.  We can’t deny it was frustrating – rather like publishing a book but with the last chapter missing.”

The following years witnessed ever-intensifying discussions between Ordnance Survey, the government, the OFT and various other interested parties to bring these licensing regulations into line with current attitudes and regulations concerning freedom of information, competition and third-party access to public data.

Between April 2010 and May 2011, various far-reaching licensing relaxations were finally announced. One of the many changes was to the 1:50,000 mapping, which could now be produced by other publishers in formats that Ordnance Survey had previously been unwilling to provide.

For the first time since the inception of the Landranger series in the 1970s, a new full-sized sheet map at 1:50,000 was born. The whole city is now available, at a glance and on one sheet – and using the most up-to-date version of the familiar, authoritative Ordnance Survey mapping that has been part of the national consciousness for nearly four decades.

The map has an RRP of £6.99 (zero-rated for VAT) is available from a wide range of retail outlets and on-line at

ISBN: 9781847368195


About Cassini

Cassini Publishing Ltd (Cassini Maps), provides high quality reproductions of Ordnance Survey historical mapping. The company was formed in 2006 with the aim of scanning, preserving and providing web and print access to the UKs national heritage of historical mapping.

As well as producing printed maps that match modern day OS maps for easy comparison (never previously attempted), Cassini  provides immediate downloads and prints of many different types of historical OS mapping using Cassini ‘Mapmaker’, an on-line browse-and-search service that allows users to identify easily their area of interest on a historical map – a vital tool for genealogists, researchers and anyone with an interest in the history of their local surroundings.

Cassini Publishing Ltd is based in London and Berkshire and can be contacted via, or via e-mail on or on 0845 230 0952.