Neck

S1, E6: Invited to a weekend house party by Sir Basil Turton and his younger wife Natalia, John Bannister is struck by the lady's infidelity. She tries to undo his pyjamas and is plainly having an affair with another guest Major Haddock. Jelks, Sir Basil's loyal butler, has also noticed and when Natalia gets her head stuck in an abstract sculpture he knows precisely how to cut her down to size.