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I thought that would be an explanation, there isn't that many high current devices on the circuit, but I guess a culmination of every turning on all at once could add up.

Earlier today I turned off the power to consumer unit as I wanted to change a light switch. After changing the switch I reactivated the consumer unit main 100amp breaker, at which point the MCB for the Ring Final at the back of the house, on a completely different circuit activated and turned...