Weikai called me last night to say he has found a free venue in Eton which is in a pub. The rooms allows use of a separate function room and the punters simply buy drinks at the bar.
There are a few such places around and they do provide a great opportunity for TB sessions. There are obviously a few things to be mindful of, most notably the effect alcohol might have on discussions! Pubs are very much at the heart of the community and so would facilitate another path of connectivity to potentially a broader and more diverse group.