Hmmm, wonder what he means by 'unaffiliated runners' when the very first rule on the BNRA site starts 'Competitors must be members of a bona fide Athletic Club'? :-/
I am U/A but am a member of the FRA which, when I checked with the Ben secretary, was sufficient for race entry. Hope this helps.
Oh, and I already have accomadation sorted ;-)