craftgrrl | questions, questions... involving buying stuff mostly

Hi everyone :) I have a bunch of questions to ask you all, especially all of you UK craftgrrls.. well, I can't be the only one! Apologies if I've missed anything that can answer my questions in the FAQ...

Firstly; anyone know of any UK based online stores selling crafty stuff? I'm interested in everything at the moment, but especially jewellery making, really original fabric and beads. I've seen LOADS of great stuff, but it all seems to be US based, with a postage fee that I can't afford (on top of the things I'd buy).

Secondly, I'm going to be in London for a little holiday at the beginning of August. If anyone knows any really great (and/or cheap) craft shops there, please let me know so I can make a visit. Or just if anyone has anything to recommend to me there, if no-one minds us going off topic..

Thirdly, does anyone know of any sites which could tell me anything I need to know about sewing machines and how to use them?

Thanks in advance for any replies :)