However, in case you are questioned - either in the UK or abroad - it is a good idea to have with you a letter from your doctor confirming your need for the medication. Always carry medicines in a correctly labelled container as issued by the pharmacist.

What medicine can I bring into the UK?
Drugs controlled in this country are generally also controlled in other countries. Before you travel you should seek advice about the requirements. See the HM Customs and Exercise website for details.