Can you recommend any new/vintage boutiques in the London area?

I’m looking for any stores that I might not know about. Some hidden gems if you’ll.

I’m looking for funky but sophisticated evening wear/dress

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Answer:
I was walking down carnaby street and came across an alley that took me to this like mini-square behind the shops, with lots of vintage boutiques!
i cant really describe where it is, but its somewhere opposite american apparel

Or try topshop boutique!!!