 The Union Flag can be found in the canton of several of the ensigns flown by vessels and aircraft of the United Kingdom and its overseas territories.These are used in cases where it is illegal to fly the Union Flag, such as at sea from a ship other than a British warship.Normal practice for British ships is to fly the White ensign (Royal Navy), the Red ensign (Merchant and private boats) or the Blue ensign (government departments and public corporations).