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apc
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Am surprised the dimmer worked normally though?
Lots of old dimmers don't care.
Cables look a bit old too 😣
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.
jellybaby
Bobbo
It doesn't really matter, a switch can go either way round if it is just a one way switch.