I'm definitely up for meeting up.
I'm currently based in the West Midlands, but London is only one hour away on the train, so not a problem really.
Don't know if anyone has a given weekend in mind, or just mention it when one happens to be heading to London. I've got a trip to London planned sometime this autum, but think my missus wants to go to a musical with a friend of hers, so this would be my ticket out of having to sit through that.