The Army Medical Services Museum at Keogh Barracks near Aldershot (south west of London) is worth a look – the displays follow the development of medical, nursing and veterinary services from medieval times to the present, with a significant section on the Great War. Interesting to note that army doctors had to fight to be taken seriously at first, just as did nurses later. Take your passport with you, you have to show ID and be signed into the barracks as a visitor!