If you are in Scotland any colour other than red or black is possible - mine are all white, least visible. In England I think the EID ones have to be a different colour or something.
I have so far not cut the hoop, and have not had any ripped...
From several discussions I also know that if the ear is badly damaged and it is unfeasible to re-tag in that ear, then having the tag in a secure place and explaining that on animal welfare grounds it is not possible to re-tag they (AH) are understanding.