John Rumm wrote:
Dave Osborne wrote:

Sounds like the faceplate may be faulty. Can you take the faceplate off

Indeed.

and measure neutral-earth resistance at the connection terminals. This

Check the live to earth resistance. If it were a neutral to earth bridge
then it would probably cause a trip even with the circuit MCB off.
(assuming the RCD is shared between a few circuits)


Yes, I thought that, but a live to earth fault would make the plate live
and the OP would probably have noticed the tingle. Probably worth
checking both as Graham said.