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If you're talking electrically, it doesn't matter whether the CPC is connected either.Regarding the cooker hood in question, if the OP cuts off the schuko and fits a UK plug then it does not matter electrically which way round he fits the two live conductors.
(Obviously the CPC must be connected to earth and if the other two wires are brown and blue then one would connect them as usual but if they are not...)
If you're saying the CPC must be connected, then the upstream fault current protection must be suitable to clear the fault also. Presumably you are relying on the final circuit's device or the RCD in that case?