As an ex landlord of a pub in London, i can tell you not many will be too happy to have large groups of an unkown entitly decended on their premises, especially in central London where the anti terrorist alert is currently high. A pub will prevent anyone under the age of 16 attending unless they are accompanied by an adult.
What would you class as "large numbers"? 10? 20? 50? 100?
I think part of the problem is that we don't really know how many we're expecting. The Facebook post suggests a dozen from the number of comments saying it, or people sharing it; plus those saying yes or likely on here so far, my guess would be about 20ish.
Damn, London is my hometown but I'm not able to be there that weekend. This sounds like a lot of fun as well - I'd love to meet up with the famous Bran. I'd recommend somewhere cheap and cheerful - somewhere like Regents park where plenty of people can come, there's not necessarily any pressure to spend money - but there're plenty of nice pubs and stuff around that area where people can go. I'd avoid making it something that people have to spend money at - then again, it's England so it'll end up in the pub anyway.
With all due respect intended Brandon, not everyone is going to know who you are. So when you decide on the restaurant, how would we find you? Also are we sitting on one big table or what? (If I come, which I may just be able to!!!)
Edit: Can someone please answer my question (sorry if I bothered you with my impatience ... just need to forward plan)
Hopefully I'll come back from my break; this break is fun; I play intellectual games.