if you research it you should find out bout the criminal records. It will say on the uni web site if they require it!
the only unis that do vet in scotland are Edinburgh and Glasgow, and although they say they dont accept resitters, there is always exceptions to the rule! i dnt have the minimum grade, but i got interviews because my SE teacher wrote about my mitigating circumstances in my reference. they also say EVERYONE MUST HAVE an A in higher chemistry, but i know alot of ppl who got in with a B. they also say the you must b interviewed to get in, but i know graduates who got unconditionals without interview.
i think they write these things to weed out the ppl who arent determined enough to try, if your gunna try against all the odds then youre obviously very commited to the career.
if you are good enough, have enough work experience and can come up with a decent reason for why your resitting, it shouldnt b a problem.