A new service is now live to help you find your NHS number. This is one of the questions that will be asked when you need your covid vaccination and when people don’t know, they phone their GP surgery.
NHS Number Finder

Asking people to utilise this service instead will help reduce unnecessary contact.

You can also use this service on behalf of someone else where the name, date of birth and registered home postcode is known. You can opt for the number to be sent to you by text, email or letter.