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  • Old and damaged is one thing but haven't lighting circuits been 5A for a very long time? BS546 is from 1934 and that had 5A fuses in distribution boards[1]. Not sure what came before?

    Perhaps not double insulated though but that's not something any fuse will help with.

    [1] I think, I can't find a reference at the moment. I have a recollection of an IET article but can only find ones about plugs at the moment.

  • It's normally 6amp in the consumer unit which protects the cable to the socket.

    The cable from the plug onwards could have much lower capacity than the lighting circuit cable.

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