In a situation like this Adam, provided that you can, get anyone that you can on your side, wether it be NICEIC or a local Electrical Inspector.
Look, I work for the local PoCo here, and I have got Inspectors in on jobs where dodgy wiring has happened, they won't hassle you, if they did I would be very amazed.
Majority of our Inspectors only work for Safety, that and that alone, don't be afraid to call them, that is thier job.
Besides, most Inspectors have come from the Contracting side of the Trade too.
At least here they have.
But let's look at the effects of a 32A MCB.
Under normal conditions, a 32A MCB will take:
32A x 1.5(Close Excess Current)= 48A
There is no way that a piece of 1.0mm, even 1.5mm could sustain that sort of overload, no matter how short.
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