The NHS offers screening, free of charge, to identify pre-existing health problems of which you may not be aware, nor be exhibiting any symptoms. The NHS screening may be as part of a national programme for specific demographic groups or may be opportunistic screening when a patient discusses a related problem with their GP.
The UK is seeing a significant outbreak of measles. The UK Health Security Agency, which is part of the UK Government, has declared a national incident. You can read about the outbreak here: https://www.bbc.co.uk/news/uk-68028530 Two vaccinations are needed to fully protect you against Measles, mumps and Rubella. Measles is a highly contagious disease which is