probably the cutting of it for installing bouble pole device or transformer / contactor etc.. or the swapping of split load sides to increase one side's capacity ( in ineven split loads.. )
And what are you going to do about the tests that should be done, and results recorded on the certificate that should be issued, to prove & show that the circuit is safe with a 20A breaker on it?
BTW - you do know that changing an MCB rating is notifiable, don't you....
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