Gap year medicine application with AAA achieved???Watch
You will often even be at an advantage by applying with grades in hand rather than awaited grades. You would need to check this but I believe Cardiff and possibly others,give more points for grades already achieved.
The main thing you will need to do is demonstrate in your personal statement that you are doing something productive with your gap year and not just sitting in your bedroom playing on the internet for a year. It doesn’t have to be medicine related, just something constructive like working to save money, travelling, volunteering, whatever.
But you can very definitely apply with your grades, so please don’t let anyone make you think otherwise! If you are set on medicine - it is much better to take a gap year and apply for undergraduate, Han to go through a bioscience degree and then try to apply as a graduate, which is much more competitive and has financial implications.