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Another question, pardon me. Is it worth borrowing an Earth Leakage Clamp Meter and checking each trailing lead? I don't know how sensitive they are, and if they work on a normal domestic trailing lead? Cheers.

Would it help to change the old board for one with an RCD on each pasrt of the domestic circuit. Presumably that would split the leakages and give a larger total permissible leakage? Electrician said 30mA too large, should be 10mA for a new board. Is that right?

Could do with some help. Domestic RCD trip on main switchboard keeps going at random, unrelated to anything being switched on/off. Board has single Wylex 30mA trip unit about 14 years old. Takes down entire domestic supply. Sometimes goes days between trips, last night went twice within 5...