I was considering spending a day seeing what I could pick up at charity shops around London and was wondering if anyone has any experience of good ones to go to?

I'm mainly looking for ones that have a lot of records but if you know any that consistently seem to have good stuff and are willing to share, please do.

I've been to one near Ladbroke Grove tube that had quite a lot of vinyl, mainly dance 12"s from the 90s that I'd never heard of. A couple on Walworth road seemed to have a few '60s rock 7"s.