Stafek wrote....

Where you're on less firm ground is their suitability for
short-circuit
protection with only a 40A MCB

snip

For one
thing, you'll do no harm by replacing the 40A MCB with a 32A unit.

Bah!

When my friendly local Sparky was round a couple of nights ago I asked
him if he thought the 30A MCB which had been feeding the previous
setup was man enough for Christmas Day, and he said no and fitted a
40A. I suppose he works on the basis he doesn't want to get called
away from his Christmas Lunch!