RAF Wainfleet is a weapons range on The Wash on the east coast of England near Wainfleet, in the civil parish of Friskney, although the north-east part of the range is in Wainfleet St Mary.
Courtesy of Wikipedia.
Oooops, I got beaten to the answer!
Google Earth says that it's a pub called 'The Barley Mow'!
TCF