Sorry to quibble with your findings Scroggs, but several sites, including Yorkshire Air Museum's own site, have Elvington at 1.92 miles, which is a little over 10,100 feet.
This figure is also quoted on Maurice Greenaway's aviation site, but then the same page also mentions a length of 3,018 meters, which is about 9,900 feet.
Keith Lindsay has some useful info on his site, for current airfields:
http://www.lindsay.flyer.co.uk/airfield.htm
just select the country from left margin.
Some of the longest runways in the world are in South America. La Paz boasts a runway of just over 13,100 feet(c4000m). The local joke is that the runway length is the same as the altitude!
Embraer have just completed a runway of length 16,404feet(5,000m) at their facility at Gaviao Peixoto.
