I have registered for Patient Access through my surgery. Very easy to do. I was simply issued with a registration letter which included a passcode.
I am now able to book appointments online, get repeat prescriptions and see my medical history. I don't think that all the finer detail is listed, but you do get the date and for instance something like "chesty cough" or I guess operations such as 'tonsils removed'. So not detail exactly but enough to jog the memory. It goes back many years.
Hope that helps.