Anyone familiar with the Halfway Coffee website? It's a database of cyclist-friendly cafés across the UK. I have no affiliation to it, I just came across it while looking for something online and thought it looked possibly useful...
http://halfwaycoffee.com/index.phpNo idea how well maintained the site is, whether the information is up to date, and I've already noted one or two significant omissions in my area but on the other hand, I've found a couple of places I didn't know about that look worth trying.