These Bomb Sight Computors were sold in 1950-60s by Arthur Sallis, 93 North Road, Brighton. Although I bought a lot of surplus electrical stuff from this interesting shop, I never bought one of these computors (note spelling) In his illustrated catalogue they looked to be a mass of dials & gear wheels.
One purchase I did make was a time bomb mechanism. These were electro-wound spring mechanisms that could be set form 15 mins to 44 days. It did work, but schoolboy meddling with a screwdriver soon put paid to that.
I'm a bit confused about the Stores Vocab Ref, it doesn't tie in with the 1948 lists I have. Although other wartime bits I have seen do conform to the 1948 lists. So perhaps there was a change of system during the war?