Cardiac Arrest - 1979 - A Bus for a Bus on the Bus 7'' (UK)
"A Bus for a Bus on the Bus" is the only 7" single by Cardiac Arrest, who later became Cardiacs.
Until the release of the The Special Garage Concerts Vol II, none of the tracks on the 7" had been reproduced anywhere else. The single was supposed to contain four tracks and not three, but the limited space on the 7" format prevented it. The fourth track was to be "Keep Your Dead Mice with You"  , which was later re-recorded as "Dead Mouse" on the Toy World album. The single is one of the rarest Cardiac Arrest/Cardiacs items.
source Wikipedia (link)