The Bristol Aero Collection Trust (BACT) plans to create an aviation heritage museum and learning centre on the remaining part of the site.

BBC: Filton airfield

Mr Lane took a special interest in the two patches, learning that the British Museum had never determined what was under them even though the map had been in its collection since 1866 and was on show in 2007 as part of the quadricentennial of Jamestown, Virginia, the site of England's first permanent colony in America.

ECONOMIST: The mystery of Roanoke