Thank you for all your posts.
Yes I am interested in medicine although I wouldn't totally rule out some other clinical profession, not particularly interested in radiography despite my Physics degree. Also being a pilot (answering aggie's post) I am aware that some of the people I fly are creating a difference somewhere, but the reasons I want to change are numerous. Firstly I have always been interested in medicine and its the best application of Science there is, imho. Further, my personal experiences with my mum, I have also achieved what I have set out to in aviation, the only progression is bigger aeroplanes, this does not equate to requiring more skill please note! Also making a small difference on a daily basis to society, and interacting with people.