London shops with a good AV section.

We are " up the smoke" on Friday for The Terracotta Army show. I am looking to get an Av stand for the TV DVDP etc. I'm thinking of a cantilever type one. There are loads of shops on the web but I'd I'd like to see some in the flesh so to speak.
Harrods and John Lewis spring to mind.
Any others?
TIA


Howard