this is from the government website,conditions have changed now
Nurses sponsored must:
have obtained full registration with the Nursing and Midwifery Council; or
have passed the Nursing and Midwifery Council’s Computer Based Test (CBT) of competence; or
have obtained a Nursing and Midwifery Council permission before the 30th of April 2015 to undertake the Overseas Nursing Programme, and be sponsored to undertake a supervised practice placement as part of the programme, which has been approved by the Nursing and Midwifery Council.
Evidence of 1,2, or 3 above must be presented to the Home Office on request, and MUST be provided if applying for a Restricted Certificate of Sponsorship.
Band 3 and equivalent: £17,787
Band 5 and equivalent: £23,023
Band 6 and equivalent: £28,050