Screwfix is generally PxCables, and yes, its not great. I have much the same problem with Prysimian, which is supposed to be a premium brand! JSB aren't so great either.
I like Doncaster and Drakka, nice flexible cables with good old fashoned french chalk between the inner and outer insulation. Only problem is, you can't easily write on the outer insulation with the humble HB pencil!
Donnie, Draka, CCC, Hanni, that Irish Harris fella (is that stuff still around?) all strip fine. The cheap Screwfix one seems ok - quite plasticky like the old smoke free - but easier to strip.
The worst by far is Wessel. I got 5m into a roll once before it became impossible to strip the sheath. Don't know if you still get it, but I have avoided it ever since.
Never had a problem with any particular brand of SWA, but anything over 95mm is a ******* to strip! And never used Hituf, so don't know about that.
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