What course are you applying to? What are the stated standard entry criteria? Does this match with the average tariff entry scores for the course (as identified in e.g. league table rankings)? Is there other relevant external data that would inform (e.g. for medicine, is there a scoring matrix or cutoffs)?
Your question can't be answered as it's simply to vague.
For example AAA would suffice (if not indeed be beyond the requirements) for most courses at Exeter for example, either explicitly (due to the standard offer being under that) or implicitly (due to the average entry tariff being lower due to them being more flexible in making offers and accepting near miss applicants). However there are some it wouldn't suffice for either explicitly (it's below the standard offer for a competitive course that tends to be less flexible on results day) or less explicitly (e.g. medicine at Exeter where in past years based on their scoring matrix for shortlisting, in order to be shortlisted for interview non-contextual applicants generally needed A*A*A* or A*A*A).
You need to be more precise in what you're asking (and it would probably help to contextualise that in terms of why you are asking so people can advise if it's such a relevant consideration in the first place).