Coldcut produced and released "Doctorin' The House" as by Coldcut, the title of which was a pun on their original "Doctor In The House" available to DJs for some time before. The "Doctorin' The House" release also featured Yazz and the Plastic Population.
The KLF thought this was a jolly amusing pun, and worked on their "Doctorin' The Tardis" using Gary Glitter, the Doctor Who theme and The Sweet and released it to world-wide adulation and admiration.
Around the same time (but probably before), Coldcut produced Yazz' first solo single, "The Only Way Is Up", again featuring the Plastic Population, and billed to Yazz and them. No mention of Coldcut, except in the production credits. The video to this single (which was a UK number 1) showed a DJ scratching with a KLF record. I assume at the time that it was the back side of "Burn The Bastards/Burn The Beat", as I don't think "Doctorin' The Tardis" had been released then. Try checking the relative release dates of the latter with "Doctorin' The House".