Have you seen this page? It has links to a bunch of other pages that might help. The key quote is probably this one:
There isn’t one main EA community in London, there are quite a few subgroups based around different causes, workplaces and interests. There are also people who have an interest but attend an event or get involved with a relevant opportunity once every few years.
FWIW, this tracks with my experience as someone based in London but doing only occasional socialising with other EAs.
Have you seen this page? It has links to a bunch of other pages that might help. The key quote is probably this one:
FWIW, this tracks with my experience as someone based in London but doing only occasional socialising with other EAs.