Grades aren’t that important for vet school. You need to achieve the minimum which is normally AAB or AAA (check individual schools) plus GCSE requirements, but someone getting 3 A*s is not going to be placed higher than someone just getting the threshold. This is because while yes, it is an intense course and you probably do need a baseline of being academic to succeed, the biggest issues within the vet course and career is burn out or not having the right characteristics. The content is actually mostly difficult due to how much there is to remember, rather than being hard to understand - obviously some people will find some things harder than others but everything is logical to follow for the most part, not to mention most of the actual learning comes after graduation anyway on the job rather than from memorising lectures, so someone getting lots of A*s won’t necessarily make a better vet.
The “talent” and good qualities that vet school look for are things like very good communication skills, organisation, team working, determination, empathy etc. They can teach you anatomy and physiology, how to do procedures and drug calculations etc but they can’t teach you those personality things, say even though you’re an animal doctor you have to deal with their human owners all the time so some people don’t always realise you do actually need very good people skills for the job. Work experience is highly important because it makes you realise the realities of the career like this and also allows you to showcase that you have those qualities, so referring to it often in applicants and interviews is a good idea. Actually one thing they like is someone who has non-vet hobbies too because as I said burn out is a big thing - they don’t actually want you to live and breathe vet med, there’s no point only accepting people getting 3 A*s if they burn out and drop out in first year. This is a massive thing, our pass marks are 50% and getting any higher doesn’t mean anything but people still compare themselves to each other and feel awful if they don’t get higher - this is a thought process that students ideally need to stop or it gets too much easily when you’re surrounded by other bright people.
If you want a more grades focused school for applications, I believe Cambridge may look at them more, although my info isn’t that up to date. Bristol doesn’t interview but has forms instead. But all vet schools will have their own processes with extra question forms or situational judgement tests or different types of interviews. Choosing a process which suits you most is a good idea so maybe do a spreadsheet as there isn’t that many vet schools.