Will your GP want to see your deed poll?
Practices vary. The Rotherham NHS Foundation Trust says a GP may ask to see a legal name change document such as a deed poll or statutory declaration, although showing one isn’t a legal requirement. Have it ready, and you won’t be held up if they do ask. The Rotherham NHS Foundation Trust: changing your name, title or gender
If you’re registering with a new practice at the same time, give your new name on the registration form and mention your previous name, so your old records can be matched to you.