The Civil Defence Service was a civilian volunteer organisation established in Great Britain by the Home Office in 1935. In 1941, during World War II, the use of Civil Defence replaced the pre-existing Air Raid Precautions (ARP). The Civil Defence Service included the pre-existing ARP as well as wardens, firemen (initially the Auxiliary Fire Service (AFS) and latterly the National Fire Service (NFS)), fire watchers, rescue, first aid post, stretcher party and industry.
Following information taken from Flags of the World:
"Sir Gerald W. Wollaston, Garter King of Arms, thought that the Union Jack was a royal flag and should be flown only on royal and government buildings. He proposed that there should be a land flag equivalent of the Red Ensign, and suggested that it might be quarterly blue and white with the Union in first quarter, and for civil authorities, a badge in the fourth quarter. He received no support for this idea, but adapted it when asked to design flags for the National Fire Service and Civil Defence Service.
The Civil Defence flag was quarterly blue and yellow with a Union first quarter and a Tudor crown in colour above yellow letters C D in the fourth quarter. Garter wrote that quarterly flags should be square but that, as when flying, part of the flag was concealed, it was desirable to have the length greater than the depth. He proposed 5 : 3 as a good compromise. The flag was approved by King George VI on 11 August 1943, and first used on Battle of Britain Day, 26 September 1943.
The flag was printed in one piece, which included the Union canton, but not the Civil Defence badge. The latter was stencilled on two pieces, and sewn on separately. The Scottish Office thought that there might be a problem in Scotland, since Garter had no jurisdiction there, but Lyon King of Arms raised no objection to its use. One flag was issued to each scheme-making local authority in England, Wales and Scotland. Any additional flags were to be made locally with no reimbursement."
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