Presumably due to the depiction in the film, Swansea Library would not give permission for filming. The film uses the Glynn Vivian art gallery, directly over the road, for exteriors instead.
When John mentions going to parties just so that people can get the name of his tailor, the shot before shows Jean with her arms down. When it cuts back, she is resting her head on her right hand.
John Lewis: What he does, you see, he puts the canvas on the floor, chucks some whopping great dollops of paint on it and drags a naked woman across it. Yes. Yes. Sort of job I'd like, that. I'd enjoy cleaning the brushes anyway.