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Thanks, I'll swap the switch out and put it the right way round rather than copying the old wiring. Cable looks OK casing split near the ends, probably due to age making it a bit more fragile?
The light has stopped working so I'm hoping this sorts it, if it's the light fitting I'll get an electrician in.
I think we have an EICR as the property was rented before us, I'll have a look.
apc
Lots of old dimmers don't care.
I think that is imperial spec stranded 2 core lighting cable. It's probably okay if it is in good physical condition. There may not be an earth / CPC which restricts the fittings that can be used.
I'd still swap the dimmer with a regular switch but changing things like light fittings might not be a good idea unless you can check the earth or the fitting is double insulated.
Perhaps time for an EICR so you know what you have.