ok found some info:"In the early 1930s a 7,500,000 cubic feet (210,000 m3) waterless holder was constructed.[1] This holder, which is over 300 feet high, remains as a major local landmark.""Painted on the north east side of the gasholder are the large letters 'LH' and an arrow to assist pilots locate Heathrow Airport's (now closed) runway 23 when making visual approaches. The letters were painted in the mid 1960s after a number of pilots became confused between Heathrow and the nearby RAF Northolt (which has a similar, though smaller, gasholder under its approach at Harrow). Northolt has a much shorter runway and is not suitable for very large aircraft although one Boeing 707 did land at Northolt by mistake [9] and a number of other aircraft had to be warned off by air traffic control at the last minute.""The gasworks was used as a space centre fuelling area for Doctor Who in 1970.[3] The site was used in an episode of The Sweeney in 1975 and in spin-off film Sweeney! in 1977.[4]"http://www.doctorwholocations.net/locations/southallgasworkshttps://mw2.google.com/mw-panoramio/photos/medium/32092271.jpg
Ron Gill ● 4152d