Zone 0 is inside the bathtub. Damn, so I can't put an outlet there? Zone 1 is over it, and zone 2 is 2 feet around it, and allows 12-volt outlets for small gadgets. Beyond that you can have ordinary outlets with the right circuit breakers (aka RCDs, GFCIs) integrated into them.
Maybe the UK is doing something weird here, but bathroom outlets are very much common in the EU.