Civil Defence Ministry
From Tardis Wiki, the free Doctor Who reference
The Civil Defence Ministry distributed 2.25 million free air-raid shelters, for people to erect in their back gardens, during the London Blitz. (PROSE: The Time Traveller's Almanac)
Behind the scenes
In the real world, the ARP changed its name to the Civil Defence Service in 1941. However, this has not been stated within the DWU.