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Thanks for the reply, I'm grateful. I know I don't need the RCBOs, its just as the older wiring was done in the 80s it might be better if I put those circuits on RCBOs so if there are problems(As I'm moving from a fused CU to MCBs) only the individual circuit would go down. I thought this because I was told RCDs are likely to trip when theres problems that wouldn't affect a CU that has fuses. I'm quite prepared to pay the spark extra to check there are no faults on the older wiring and make sure RCDs won't be tripping.
His inspection and tests will identify exactly what condition your wiring is in and also ensure it will not have existing faults on your system that would cause an RCD to operate. 30 years for PVC/PVC cable is fine and should still be in excellent condition. It's if it's been installed badly / bodged since that there can be issues. ...
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