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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!
As long as your cable is the right size and you an turn the water off its relatively straight forward yes. If your going to do that make sure you get one that the water connection is on the same side as the existing one.