For anything its 300mm from sink or bath or 250mm from drain on a shower/wet room or at high level which iirc is above 2350mm high to be outside the zone. You can get away with a dry location if its boxed in or under the bath but needs to be accessible and protected from water ingress (depending on location).
Its taking shape really well rich, really do like that shower
Edit: and as its a bathroom it either needs to be on a 30mA rcd/rcbo at the CCU or cross bonding needs to be carried out between all circuits in the bathroom.
But to be honest if your just refurbishing the bathroom and not having major work involving building control or having the works certificated no one will ever know or be bothered