Manston is only 9026', but was originally 300' wide and was built as an emergency crash facility for damaged returning bombers in WW2. It also had the FIDO system which dispersed fog by burning vast quantities of oil in troughs next to the runway. The tanks can still be seen.. .. .Uk's longest is 27R at Haethrow at 12798'. Longest military is Boscome Down at 10535'.