There has to be some lil stores that sell bay-area rap in london.
Cause here in Helsinki,Finland there are few shops that sell classic bay area cds (i.m.p.,11-5,cellski,totally insane etc etc)
So there has to be some places on so big city like london is.
When i was last time in london 5 years ago.
I found mostly on vinyl records some classic g-rap
the recordstore was in camden market so go there
(there are lots of cool shops in camden market)
But in london they are mostly selling house,electro,techno and that kind of vinyls but i am sure that u will find some place that sell bayarea rap if u have time to look around