Can you go from Physician associate to Medicine?Watch this thread
The accelerated graduate entry medicine (GEM) courses are considerably more competitive than standard entry medicine and you need to pay the first £3000~ of the tuition fees out of pocket yourself. While you can apply to standard entry as a graduate I understand it can still be more competitive for graduates, and more importantly it is much more expensive, as you will only be eligible for a maintenance loan and not a tuition fee loan for the first four years of the course - requiring you pay the ~£9250 a year tuition fees out of pocket.
If you’re a graduate thinking to do PA but you think you want to do medicine I would advise first of all seeing if you can get some work experience with both. However, I would also advise considering just doing medicine because chances are that same bug will be biting after you graduate from PA.
For medicine you have the standard undergraduate route open to you and also the graduate entry route if you’re a graduate, although this is competitive.