Ruby81, and others here, we’ve been discussing elsewhere on these forums about Gingerbread groups. TLDR; there aren’t many groups and the ones that seem to exist may actually be long dead. If you filled in a form at the Gingerbread groups page don’t be surprised if you don’t get a reply.
Given that there are several of you in or around SE London, maybe you should all organise a meetup yourselves. I don’t know if you are even allowed to do it on these forums though (when Gingerbread help organise a group they make the group coordinator go through a DBS and what not!)