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davesparks
If the voltage actually exists, as well as checking the switch, the remainder of the circuit (i.e. in other rooms) needs to be verified that its wired correctly. I had to fix a fault, where live had been connected into neutral and neutral vice versa.
I can't see how a problem elsewhere on the circuit is going to cause this, based on the information we have, the problem exists on the S/L therefore must be limited to the switch and the wiring after it.