I have to go to London for the day - a long long day from here - and if I don't find somewhere to express I'm going to leak! I don't fancy sitting in a public loo for 20 minutes (plus it would annoy other customers if I did that at a cafe or similar). Are there any shops with good mum+baby rooms or can anyone suggest somewhere? I'll be in South Kensington part of the day, North Islington the other part.