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You can narrow it down further with lengths of cable but you might want an electrician to do that because you're going to have to do a fair amount of disconnecting/connecting and testing to narrow it down.
Once you know where it is you should be able to connect the ring temporarily to avoid the problem.
I fear it could be this then, maybe. It’s the kitchen circuit tripping now with everything unplugged other than oven, boiler, dishwasher washing machine. There looks some historic water ingress on one wall near appliances/sockets