Hi,
There is a log of who's "handling" who at http://uk.wikimedia.org/wiki/GLAM-WIKI/Events where I suggest you add them as a prospect needing contact or your name against it as our contact point. The list is a bit out of date but we have to take care about confidentiality with contact details and not announcing anything not officially announced by the GLAM on an open wiki.
It looks likely that May or June this year will see the first formally organized UK GLAM Workshop and networking session for GLAM Ambassadors (and Ambassador prospectives). After that we would hope they could be organized for every 2 months. If you would like to get things going at the Vestry House Museum, then please go ahead and make first contact as an e-volunteer offering to help with their presence on Wikipedia. I would be happy to chat about it with you virtually (drop a note on my talk page or direct email) or meet up at the next London wiki-meet ( http://meta.wikimedia.org/wiki/Meetup/London - date not set yet) to talk it through.
PS I'm on the GLAM Steering Committee which itself is in start-up mode...
Cheers, Fæ -- http://enwp.org/user_talk:fae