Join the club - I have a similar problem. I was told that even if your academic record since your first degree is exemplary, it's your academic record as a whole that is looked at. I think it's the same way for say, the university's own scholarships. This doesn't make too much sense to me, but I think it may be something to do with the number of applications the university recieves. Apparently, the '2i or nothing' rule is used as a convenient way of limiting the number of applications for a particular PhD scholarship.