Firstly please can you confirm this is just a pumped shower?
Ideally it should be run from a power circuit such as a ring circuit via a doule poled switched fused connection unit with the correct sized fuse installed. The circuit should also be RCD protected. The circuit needs to be included in the supplementary equipotential bonding arrangements for the bathroom. Please note, this work is notifiable to your local area building control under Part P of the building regs.
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