physics for medicine (esp oxbridge)

hi, i want to apply to medicine and i'm thinking about applying to cambridge. i was watching one person talking about their interview on youtube and they mentioned that they got asked why they didn't take physics alevel, and they mentioned that a lot of people applying to their college that year also got asked the same question. since the end of year 11 i was always considering teaching myself an AS in physics outside of school, which at first i gave up on as i'm already taking four alevels and thought it wouldn't be helpful. does anyone think it's worth doing, to show an extra interest in science and academics? especially for a uni like cambridge or top end medical schools which are extremely competitive?
i'm currently taking biology, chemistry, maths and latin

I wonder if A level physics might be useful if you have further career plans later on after completing medicine. Assuming of course, you enjoy physics and have a natural aptitude for it?

There's no such thing as a "top" medical school, all medical schools are considered equal by the GMC and the NHS.
Cambridge specifically you realistically need 3 STEM subjects in order to achieve a competitive score in interview for an offer, which has been the case for some time now. Either maths or physics is suitable.
For all other medical schools including Oxford they don't care and it doesn't make any statistical difference in success rates.
Your current subject combination is acceptable for any medical school, and even if you dropped maths it would still be acceptable for any medical school except Cambridge.

thank you that's really helpful ! do you think that latin as my fourth will help my application in any way? as i know it doesn't matter what your fourth subject (if you take four) or even sometimes what your third subject is, but nevertheless would it influence the way i/my application is perceived?

It's neither better nor worse than literally any other subject. Latin would be no better than English, sociology, or art. All that matters is that you get an A or A* in that subject.

physics was my highest science gcse mark but my least favourite.. but i know i want to be a doctor after medicine so to be honest i'm only considering physics if it will make my application to medical school more competitive?