The old Arrow DVD had a "15" cert and was fully uncut, so the only way this could score a higher rating would be because of special features or trailers.
Generally my feeling is that the BBFC isn't really bothered by slashers any more as long as they don't linger on the gore too long for their liking or insert a dose of torture or what they would class as "sexual violence".
I'm still amazed that, for instance, Tobe Hooper's "Toolbox Murders" redux scored a "15", with the ABUK DVD owing its "18" to the (imho great) "American Nightmare" doc.
