Like I said though, everything has been turned off and removed from the sockets and it's still tripping.
Including hidden sockets for integrated appliances (washing machine, dishwasher, etc) or ambient lighting (under/in cupboard style) wired into the sockets circuit?
The one time I had something similar it was an under-cupboard light (fluro tube) that had had steam blasted at it from the kettle too many times and would trip the main breaker whenever someone put the kettle on with it pointing in the wrong direction. Baffled the electrician for a while as the kettle tested fine on its own.
Rive's fault-finding suggestion is your best bet for fixing your kitchen mains ring. You may need to assume which way the ring starts and ends, but you can still isolate certain sockets which will help to determine where the fault is.
Including hidden sockets for integrated appliances (washing machine, dishwasher, etc) or ambient lighting (under/in cupboard style) wired into the sockets circuit?
The one time I had something similar it was an under-cupboard light (fluro tube) that had had steam blasted at it from the kettle too many times and would trip the main breaker whenever someone put the kettle on with it pointing in the wrong direction. Baffled the electrician for a while as the kettle tested fine on its own.