Shopping in UK

[Sarath]

I am going on a trip wherein London, UK is one of the destinations. I have seen many people order from UK(online) or get something from there.

Q: I would like to know what gadget or other articles can be bought there?
More specifically I mean, what is it that we can find there that is worth picking up, all the way from London?
>>>I am thinking its either more variety, latest products, cheaper(? i don't think so)

Actually looking at picking up IEMs from there. Good idea? Bad idea?

Please share your experiences with me or someone you might know who has travelled there. Just let me know of anything that you would pick up, if you were going there too.

Help!