Was this right thing to do? Was there any need to break the wall? Should he have taken a simple precaution and followed : 1. Turn off the main stopcock 2. Expose the pipes by removing Aquarian shower mixer bar assembly. 3. Close the pipes with a stop end. 4. Turn on the mains stopcock.
Installation manual - https://www.plumbworld.co.uk/documents/ ... e9901t.pdf