Which brings me to the second point - which is to ask whether Wikimedia UK could support such locally-based activities by, for example, hosting a mailing list, wiki, and/or other webspace? It seems to me to be well within WMUK's remit - but I'd like to hear what other people on this list think.
One possibility is that, once we have a wiki set up, part of it could be used for MFCG, similar to how Wikimedia UK is currently hosted on part of the meta wiki. Would that be adequate for your purposes? It would obviously have to be approved in a board meeting if it was.
Alternatively, as Mark says, ask around. I also have spare webspace, which it might be possible for MFCG to use.
Mike