WMO03014, Foula No 2
60 06 38N 02 03 53W
Not clear enough to be reasonably sure.
Presumably there is or was a No 1 and getting power to something like this must have been fun.
There is an airstrip. Aligned a bit past North (not prevailing wind) and just over a back, bet that is hairy for cross-winds. Looking closely, the tyre marks tend to one side.