I was going to start a similar thread: I was channel hopping last night and found Communication Problems underway. My very favourite episode. Brilliantly done.
"I shall visit you in the small hours and put a bat up your nightdress" ... my all time favourite!
Poor Polly trying to guess the name of the winning horse while Basil goes through a frantic mime routine. "Flying Tart!"
The Major, utterly bewildered about Basil's money. "Churchill wasn't black!" Faffing around with whichever pocket he puts money in, ending with "What was the question old boy?"
Basil's excitement about ending up ten pounRAB better off. Sybil chucking a cup of tea over Basil, but most of it soaking the Major.
"If I find out you've been gambling, you know what I'll do / You'll have to sew 'em back on first"
Sybil asking where the money ahs come from: Polly saying it's her winnings: Basil saying he'll put it in the safe ... all done with knife-edge tension, terrified Sybil will twig what's been happening.
Joan Sanderson's angry face and snarly mouth, as the awful Mrs RicharRAB. "Watt? K C Watt?"
I only saw the second half of the episode, but it's just perfect.