Go to your nearest practice (they have geographical catchment areas) and say you aren't registered with a GP and want to join them. They'll tell you what to do. You'll almost certainly have to go for a new patient screening, probably done by the practice nurse - they take your blood pressure, weigh you, test your wee, ask you about your medical history, that kind of thing.Umm question, I'm not sure I'm even registered with a doctor, so how would I end up getting the vaccine?
Everyone should be registered with a doctor, so it's a good time to do it. If you got a really bad chest infection and needed antibiotics (for instance), you'd need to see your GP for that. If you had some health problem you needed investigating, the GP has to refer you to the hospital.