If I'm a whippersnapper,that makes you a coffin dodger:^O:^OBinky, you young whippersnapper. You find generally houses wired after 73 do have a Cpc. An old house with no earth is going to have wiring considerably older than 40 years. 40 year old cable is perfectly acceptable and it would be most unusual for it to fail an insulation test. Pvc cable has been around since the early 60's and that's ok today.
Apart from the undersize CPC on early metric cable of course - only an actual issue on 32A re-wireable fuses.. Pvc cable has been around since the early 60's and that's ok today.
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