You will find a little bit of tweed goes a long way in London hotels. It's amazing how throwing on a tweed jacket with a pair of jeans and a shirt makes all the difference. I'm a bit like Tom and don't care much for fashion at all - since my family and I spend a huge amount of time in FL my wardrobe is mainly filled with shorts and tee shirts. That said I'd rather blend in than stand out so I put on something vaguely smart when I stay in London and my hotels of choice are 45PL and The Lanesborough.