It's the EDGWAREBURY HOTEL Stevie, now the Corus Hotel, Elstree. If you do a search on Edgwarebury in the forums you'll find a bit more info; I think I left some pics in one of the threads as well.
Last time I was there the staff were very welcoming - they let me wander round and take whatever pictures I wished, even though I'd just dropped in whilst passing.
It was also where Ian Carmichael and Terry-Thomas play tennis in the proper version of SCHOOL FOR SCOUNDRELS...
Smudge