I had a non-council house of that vintage - it had slip conduit, not the proper stuff, and VIR inside that, not singles, and there was no way it could be reused.
I reuse the existing conduit (imperial) but fit new deeper boxes (metric) and extend the ring as necessary. Needs a bit of fettling but it works. Sometimes the entire length of conduit springs out of the wall bringing the bricks with it. All adds to the fun.
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