Be aware that any UK doctor will (as always) consult a reference manual - this will result in him/her telling you that you will need to in effect pickle your body in assorted chemicals, at least some of which have little reliable benefit. The doctor will know no better and should not be blamed for doing howhe/she is trained to react. It is better if you know what you want to do, what you then need to know to avoid or take action against rather than trying to find a medic with a big enough sledge hammer to crack every nut in existence (as a blind pin-the-tail-on-the-donkey exercise). Lots of people travel widely without any more medication than what they do at home and manage fine. My recommendation (what I do) is to take along a very efficient antidote against digestive infections (i.e. food poisoning). This is by far the most likely problem you will encounter worldwide (including in the UK) and one where the doctor will actually know most about what he/she is recommending. There are lots of past questions on AB regarding injections, malaria prevention, etc. - see if you can find some for a degree of guidance, but don't go thinking all foreign places harbour death with every breath. Going on holiday on impulse is often the best way to do it - my favourite approach. I hope you have a great time.