Please see https://www.castledoningtonsurgery.co.uk/gdpr-and-privacy 

What should you do if your personal information changes?

You should tell us so that we can update our records please contact the Practice Manager as soon as any of your details change, this is especially important for changes of address or contact details (such as your mobile phone number), the practice will from time to time ask you to confirm that the information we currently hold is accurate and up-to-date.