The UK has introduced a new visa route for people working in the health sector, like Nurses, Doctors and Care assistants. To be eligible to apply, you must have a job offer and Certificate of sposorship with a UK employer that is approved by the home office and be paid the minimum salary for that job category. Your visa can last up to 5 years; you may need to extend or update your visa if you change your employer or if the visa expires. After 5 years you may be able to apply to stay permanently in the UK. You can apply for this visa 3 months before the day you are due to start work in the UK. You and your depedents will not need to pay for your health surcharge.
Check out this link for more information > https://www.gov.uk/health-care-worker-visa