story
Highschool in the uk ends at 16, you graduate with GCSEs. After this there are 2 extra years of education (compulsory in England), you start university at 18 (at the youngest).
Medical schools are competitive and require strong a-level results, typically 3 As (the second highest grade, after A*) [0]. It's a 4 year degree, you then go onto train for another 5 years as a junior doctor.
There is a _lot_ of training for UK doctors.
[0] https://www.manchester.ac.uk/study/undergraduate/courses/202...
[1] https://www.healthcareers.nhs.uk/explore-roles/doctors/train...