I don't know what Christopher Nolan's citizenship is, but he was born in London...
Des, what issues do you have with the Awards in the years 2001-2005? I was Awards Admin for those years, doubling as Chairman for the first two. Also, in the interests of full disclosure, I've acted as a "consultant" every year since, checking the longlists for errors of category, eligibility, spelling errors etc. I once caught someone using a pseudonym to recommend his own work.
In my day there was just one vote from a longlist, and the shortlist was simply the top five in the vote. The Awards Admin could and did recommend items to go on the longlist but was the only BFS Member not allowed actually to vote.