I teach a STEM subject at sixth form level. in the South West of the UK.
I'm also involved in the UCAS process for our school's applicants.
Our school extends support to would be medics/dentists/vets etc who don't get a uni place on those type of courses first time round.
Some pupils resit an A Level (or 2), some just need reassurance that many very able applicants do take more than one UCAS application to get a place or advise on their chances given their UCAT score/likelihood of increasing that score, or a realistic opinion on their chances.
I've noticed that the non ethnic lads at our school are having the toughest time securing places to study medicine/dentistry/vet sci, no matter how good their academic track record or how high their UCAT score, the interview performance seems to trounce all of that. I had one lad who, having applied for a third and final time for dentistry last year was rejected again post interview. He's going abroad to study dentistry and his plan is then to return and work his way through all the processes required of "non uk trained" dentists before they can fully practice dentistry in the uk. He's always been an extremely able all-rounder and I have no doubt that he'll pick up enough of the local language quickly enough to assist with his studies.
We're fortunate enough to have enough parents who are doctors/dentists/pharmacists/vets etc volunteering to do multiple practice interviews, but it's generally the girls/ethnically diverse boys who seem to have most chance of getting the offers after interviews these days even though our "mock interview panels" haven't found any major distinguishing factors between many of our school's applicants when it comes to feedback to aid interview performance in the real thing.