The amount of retraining you will need to undertake in order to return will depend upon whether you have maintained your registration. If you have been out of practice but have no allowed your registration to lapse, then you may be able to return without the need to complete a return to practice course. You will still need some support to return but this can be provided locally in the NHS organisations, in the form of an induction period.
If you are interested in returning to practice then please contact Ruth Keeler, firstname.lastname@example.org
Health Careers Returning to Nursing- https://www.healthcareers.nhs.uk/explore-roles/nursing/returning-nursing