Anybody who is anybody shops at Harvey Nicks. It has all the best designer names. Its just across the road from Harrods in London. More of a clothes store than anything else but also has beauty products and food and drink.
Fatface has all the best clothes. They are well designed and a good brand to be seen in. They are expensive though. I usually think to myself how much would I pay for this. Then double the price and thats about how much it costs. But if you want to treat yourself this is the place to shop.
Republic is great if you are looking for branded goods. I find all of their goods are really trendy but sometimes a bit pricey. Its a good place to shop on the high street.
Littlewoods stores closed down quite a few years ago but their online store is still doing well. I find some of their styles are more for older people but they are still fairly cheap and good quality.