There are two types of nurses:
Registered Nurses, (RN)
Both have to be registered with our regulating body, the NMC. There aren't many E.N. about these days, many have been encouraged to convert to Registered Nurses, but to be honest the Enrolled Nurses I work with do virtually the same job as a Registered Nurse, except they don't take charge of the ward.
For more information on the UK health care system you could visit the National Health Service Web site, http://www.nhs.uk/
Becoming a nurse requires you to undertake a three year nursing programme, validated by a university and allows you to gain your diploma. There is an option to do your degree, if you wish, but the majority of potential nurses opt for the 3 year diploma programme. More information about training programmes can be found at NMAS, (Nursing and Midwifery Admissions Service) http://www.nmas.ac.uk/
Once a nurse has completed the training course he/she can then apply to the NMC for registration and to be able to practice. Each registered nurse in the UK has to renew there registration every three years and has to maintain what are called PREP, (Post-registration education and practice) requirements, which are that registered nurses must have undertaken at least five days/35 hours of learning in the previous three years and that registered nurses must also have completed a minimum of 100 days (750 hours) of practice during the five years prior to renewal of registration. (This is also applicable to Enrolled Nurses)
Hope this helps.