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No 'fool' has spurred off this circuit. This is brand new circuit direct from the supply, via a new dedicated CU. The shower has two heat settings, this was on the higher setting, then to vary the heat on that setting the flow is varied. The 50A MCB has not tripped as you would expect...

OK, thanks for your help.

It is a Volex, I could not find any Volex 45A MCB on a google search, though I have found other makes, would any other make be compatible with the CU?

I wired in a new CU last night for my 9.5kW shower. It has a 63A 30mA RCD and 50A MCB supplied. I bought a 40A MCB and fitted that in place of the 50A, as that is what was recommended by the shower manual. However, the 40A MCB trips after about 1 minute of shower use on a normal heat setting...