Cough, Splutter
But I tidied up my cable stash and found a new 25 metre reel of 2.5mm SWA marked J A C, Unit 38 Middlemore Road, Smethwick.
Google doesn't seem to come up with anything and at that address is now Schneider Electrical.
I can't even remember buying it, so must be at least 25 years ago.
Also found a 26 metre coil of 7-core foil-shielded signal cable with another stranded steel wire outside the foil. This I do remember buying at GWM Radio in Worthing and they have been gone for over 20 years.
It has a label showing <-antenna CDU-> and marked 19360-99 Rev "0". Seems a shame to discard it.