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Thanks plugwash, ban-all-sheds and mapj1 for the useful comments. Swapping top-right and bottom middle did the trick. New multi-meter bought. Haven't had to use one for years. @pdcelec: back in the day I did my degree, we specialised in electronics, which means physics, some chemistry...

I was cleaning some paint off a 3 gang switch recently. Switch wasn't going back easily, so I disconnected one wire. At least I think it was only one wire. But I messed up: now the landing light and sitting room light will only come on when hall light is on. I'm not happy to try...