Good old fashioned charity shops in London?

[BlackFriYay]

Does anybody know of any? By old fashioned I mean where you can rummage and find bargains, not the ones marketed as boutiques that sell shein tops for a tenner (yes, my local - really)

I'm in S.E but don't mind travelling! 🙂

Penge in South East London was the place I’d heard was good. Good quality donations and brands, but low prices.