This from the Royal College of Nursing (aka nurses' union):

It is possible to take either a diploma or degree course to qualify as a nurse. Education is provided by universities, with placements in local hospital and community settings. The course is 50 per cent theory and 50 per cent practical. The first year is a Common Foundation Programme, which will introduce you to the basic principles of nursing. You will then specialise in either adult, children's, mental health or learning disability nursing. Full time diploma courses last three years. Degree courses last three or four years.