Upstairs sockets switch keeps tripping. All plugs unplugged. Any thoughts?

[BBmybaby]

We are having an issue with our upstairs sockets switch which keeps tripping. On the occasion that it doesn’t trip, the fridge and oven downstairs switch trips. Lights upstairs are working fine. It’s just the sockets. Sharing board for more info. Thanks!

Maybe the electrician has just quoted a day in case it ends up as a longer exploration.

You could always call another and see what they say and hire whichever one sounds more trustworthy.

Good point didn't look carefully enough. Presumably that's the correct way for that make of CU.
Although the whole thing is a lash up with missing blanks almost certainly a code 1 due to access to live parts without a tool.