Good call Brian. This would tally with the info in post 4, that the sockets were tripping intermittently before the change:First thing I'd check is polarity. Has the meter installer reversed the polarity, either making it wrong now or making it right when it was wrong before? This is the only thing I can think of that could conceivably cause immediate RCD tripping after a meter change
Wouldn't cause tripping in itself, of course, but would, if there was a particular common, pre existing, serious fault..
Sockets used to trip atleast twice a week before the meter was fitted. Was only after it was installed it gave up all together.