pewter
Conspiracy Theorist™
When the fridges were making it trip i did a quick insulation resistance on the fridge and freezer plug N-E, L-E and it was clear. I was thinking it could be the compressor.It would account for the problem. Pro Dave asked if you had PA tested the appliances.
When the kettle did it i thought that might be knackered also, untill he told me it was brand new. they also had a small grill ovan thing which made it trip when a load was applied, not when it just had its LCD time clock on.
When fridge, freezer, new kettle, grill thing all made it trip, the chances of them all being knackered seemed less likely.