Red Ensign
The Red Ensign or "Red Duster" is a civil ensign of a United Kingdom of Great Britain together with Northern Ireland. it is for one of the British ensigns, together with this is the used either plain or defaced with a badge or other emblem, mostly in the adjusting half.
It is the flag flown by British merchant or passenger ships since 1707. Prior to 1707, an English red ensign and a Scottish red ensign were flown by the English Royal Navy and the Royal Scots Navy, respectively. The precise date of the number one appearance of these earlier red ensigns is not known, but surviving payment receipts indicate that the English navy was paying to cause such flags sewn in the 1620s.