Yes, same place.
My understanding is that AbFab is a business that uses several locations. Kestrels is this venue. So when not open for an AbFab party, they just open as a naturist spa that doesn't mind if you fuck. So in the day it is not really a swinger party. But as with many of these things, the distinction is small. Kestrels used to be in a quiet property nearby in Stanwell Moor, but the neighbours harassed them until they moved closer to Heathrow. Had some good afternoons at the old venue.