The Sovereign’s permission must be sought whenever a British national wishes to accept an award offered by another country. If permission is given, the award may be accepted, the insignia may be worn and the relevant post-nominal letters may be used. The Sovereign does not give permission for the formal use of the title “Sir” in the United Kingdom; only those British nationals, including dual nationals, awarded British knighthoods may use the title “Sir” in a formal context in the United Kingdom. The Sovereign acts with the advice of the Government. Nationals of all the Realms, awarded a British knighthood, are entitled to use the title “Sir” in the United Kingdom. The titles of Realm nationals, who are not British, and have been awarded a knighthood by their own country, are recognised in the United Kingdom as an official courtesy.