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It will however be interesting to see how well this PVC sheathed stuff looks after a few years up in a hot roof void.
2 words Trumpy, at least as regards the older stuff in the UK. Plasticiser Migration.

Had to deal with some today on a kitchen remodel, the plasticiser had leaked from the cable where it had been run under the plaster behind a gas stove, the cable sheath was covered in sticky yellow goo, and the internal core insulation was brittle as bakelite. Lovely [Linked Image]