BJJ Black Belt
The History Of Brazilian Jiu Jitsu In The U.k.
Some more details on UK BJJ history up on RGA Aylesbury and Kamon BJJ (therefore both are from the RGA perspective), by Kev Capel and Kevin Chan respectively, who have both been around the scene a long time.
I've also put up a long BJJ history post on my blog (UK-specific bit here), but I don't have anything like the experience of the above two BJJers. That means mine is mostly based on lots of books, the aforementioned SFUK thread and Google.