Useful links for the UK:
Nurse and Midwifery Council (NMC) Registration: https://online.nmc-uk.org/Account/Login?ReturnUrl=/
Register as a nurse or midwife if you trained outside the UK: https://www.nmc.org.uk/registration/joining-the-register/register-nurse-midwife/trained-outside-uk/
International English Language Testing System (IELTs): https://takeielts.britishcouncil.org/
Occupational English Test (OET) : https://oet.com/
Contact UK Visas and Immigration for help: https://www.gov.uk/government/organisations/uk-visas-and-immigration