In the UK, your basic healthcare will be covered by the National Health Service (NHS) on the basis of being 'ordinarily resident.' 'Ordinarily resident' means, broadly speaking, living in the UK on a lawful and properly settled basis for the time being, for example having the immigration status of Indefinite Leave to Remain.
If you are applying to come to the UK on a temporary stay of more than 6 months, for example as a Skilled worker, you may be required to pay an immigration health surcharge at the time of your visa application.
Soon after moving to the UK you should register with a doctor. Your health centre will then assign a local doctor to you, often referred to as a GP (General Practitioner). We suggest you bring any medicines you need with you for the first month to give you time to register with a doctor.
The NHS website provides further information on the services available if you Moving to England from outside the European Economic Area (EEA) or Moving to England from EU countries or Norway, Iceland, Liechtenstein or Switzerland.