RGN is someone who has completed the training and registered to practise with the Nursing & Midwifery Council (UK) After qualifying, you are issued a PIN number and are recorded on the register, you cannot work as a Nurse without this and have to register every 3 years to maintain your registration. You have to complete the required amount of study relevant to your work known as PREP over the three years and have to sign a declaration confirming this before the NMC will allow you to keep your registration. There is no such thing as unregistered Nurses, hospitals and Nursing Homes have Health Care Assistants (formerly known as Auxiliary) who work under the guidance of RGN's.
Contact the Universities offering the diploma/degree for advice as it has all changed now, I just applied to the School of Nursing at my local hospital with the academic qualifications required i.e. 5 'O' levels. You can gain entry if you have an NVQ 3 in Health & Social care these days.
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