Not heard this particular rumour
That said, the airport that serves the area is Bristol which, as any local knows, is easily accessible lying, as it does, at the end of a rutted bridleway, on the wrong side of the city. Lyneham on the other hand sits on both the M4 and the main London railway line. It also has a longer runway than Bristol. It would make an ideally situated regional airport. Which is why the army will probably move in and immediately build a something on the runway. Mega.