State and official visits to the United Kingdom are formal visits by the head of state of one country to the United Kingdom, during which the British Sovereign acts as official host of the visitor. It is a royal event that involves all the assets in the Civil Service, the Royal Household and the Household Division. It also involves other members of the Royal family and is centred in London, the national capital. Invitations for state visits are sent by the Royal Household with supervision by the Foreign and Commonwealth Office.