UK Kitchen socket trip switch keeps triggering RCD even when nothing is plugged in.

[Zhelevn]

Hello & Merry Christmas,

Last week when waking up the lights and sockets in the bedrooms upstairs were off, along with the ground floor kitchen sockets. Flipping the RCD, and the trip switch for the kichen sockets and upstairs lights seemed to work fine - we have no new appliance installed or heavy current drawing cows plugged in.

This morning same happened, except the trip switch for the kitchen sockets will not stay ON, it trips the RCD unit it's on. Everything else works fine.
All appliances in the kitchen (in fact weunplugged the whole house) are off and unplugged. Washing mashine, fridge, everything there is unplugged.
I tried changing the two brown cables to the empty trip switch next to it.
Also tried changing to the second RCD unit on the right.
CU is new, installed in 2019. House was renovated before we moved in.

Any advice? I've attached photos of the CU if it helps.

 

[phil 01]

Just a thought does the time you lose power coincide with the boiler trying to fire up, switching off appliances may not be be enough because not all sockets are double poled( switching off both live and neutral) unplugging will be necessary if trying to trace a fault, another possibility is the fridge freezer, they are notorious for faults