From a friend:
Sir John Gielgud, unforgettable in so many roles – and only he, playing a butler, could so verrry stiffly and silkily respond to Arthur’s bland set-up, “I’m going to take a bath” with such genteel contempt, “I’ll alert the media,” and then keep the rhythm building a series of quiet little comic explosions:
Arthur: Do you want to run my bath for me?
Hobson: It’s what I live for.
Arthur: I just broke up with Linda.
Hobson: I can’t imagine why; a little tart like that could save you a fortune in prostitutes.
and so on.