Red Ensign
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The Red Ensign or "Red Duster" is the civil ensign of the United Kingdom of Great Britain and Northern Ireland. It is one of the British ensigns, and it is used either plain or defaced with either a badge or a charge, mostly in the right half.
It... Wikipedia
Adopted: British Merchant Navy
Design: Red with the Union Jack occupying one quarter of the field and placed in the canton
Proportion: 1:2