Old UK Cables

Hi Guy's & Gal's

Anyone familiar with an old wiring cable used in the Uk or particular around Peterboroughs Welland Estate as I know it was used here also, possibly in 1970's its almost a twin and earth in the way that it has solid core pvc conductors however instead of being encapsulated in a pvc sheath separated by chalk during manufacture this is a black hard rubber outer sheath where the single core pvc conductors run loosely within so they can actually be pulled through and replaced. I have a customer who's installation still uses this cable and was wandering what British standard this cable was manufactured too,anybody have a clue. Thanks

IIRC It's called "Pre Wired Conduit".... I've not come across it myself yet

It had a Trade Name that I cannot remember

Rep,tried selling it to us and an Architect spec'd it on a job. Both were told where to insert said product. IIRC it came in pre ordered cut lengths