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Thanks PW I've tried that but to no avail... if "someone" had connected the new switch up incorrectly on "their" first attempt at replacing the old switch, could "they" have caused damage (to the wiring or the switch) that would mean a subsequent correct connection still wouldn't work...

Made a boob, I was replacing lots of crusty old switches in my house (Canada 1950's - I assume the electricals are from new) and I seem to have messed up the 3-way switches (1 at top and 1 at bottom of stairs). The wiring as I said is old and does not seem to conform to any wiring diagrams I...