Does anyone know of any good record stores in London?

I’m mainly after jungle/dnb/techno vinyls but I listen to all sorts of music from reggae to psych rock to metal. I’d like to find a good record shop where I can go and just mooch around for a good while. There used to be one back in my hometown and I used to buy vinyls every week until the record store got closed down.. wounder! I stopped mixing not long after that because I got bored of rinsing the same old jump up tunes all the time but I’d like to get mixing again

I also have a mooch around charity shops too because you can pick up some hidden gems there for pennies from time to time