You should be able to find your NHS Number on any letter or document you have received from the NHS, including prescriptions, test results, and hospital referral or appointment letters.
If you cannot find your NHS Number at home, you can ask your GP practice to help you. They should be able to provide the number for you as long as you are registered with them. To protect your privacy, you may be asked to show a passport, driving licence or some other proof of identity.
For further information about the NHS number visit NHS Choices.