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Further inspection shows the shower on a 30a fuse, and as-yet undetermined cable size. Looks chunky but I haven't had a proper look yet so could only be 6mm.
Changing cable and/or fuse are part p and building regs jobbies so that rules out DIY. Plus the tiles are all coming away from the wall in one big sheet so that needs sorting before anyone is crushed by falling ceramics whilst washing their hair... The list of jobs get longer but at least tiling is something I can do!
Is replacing an electric shower as simple as connecting up the existing elec and water supplies and sealing with appropriate bathroom sealant?