My house is a 1950s 2 story semi.
I am connecting one fluorescent downstairs kitchen light in parallel with
another fluorescent, without taking up any more upstairs floorboards.

I have found a mass of single core PVC wires.

Does anyone remember what colours were used in the 1950s lights for wiring,
so that I can cut the right wires?

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Dave Fawthrop dave hyphenologist co uk Google Groups is IME the *worst*
method of accessing usenet. GG subscribers would be well advised get a
newsreader, say Agent, and a newsserver, say news.individual.net. These
will allow them: to see only *new* posts, a killfile, and other goodies.