@geoffl I had similar weirdness when I got a smart meter fitted. When it came up the upstairs lighting RCBO just kept tripping under load, even from other circuits.
Eventually I managed to get a spark in who found out it was a neutral-earth short in the metal lamp fitting in the spare room. The hasn't been touched in the 4 years we've been in the house and has been like that since we had the CU replaced.
No idea why it decided to start tripping then, but at least it was easy to fix.
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