Ripped apart my downstairs bathroom including taking all plastic cladding off walls and ceiling, take tiles off walls, unboxing the ... boxing in, toilet, sink and cabinet out and capped and an hour spent trying to work out the electrics (16a circuit labelled as alarm powering lights and extractor fan with buried wiring confusing the matter).
Just tidied up the wiring to remove a wall switch ready for a pull switch and new light.
The good news is that the walls and ceiling are relatively sound. I expected all sorts under the cladding didn't expect boards on the ceiling at all so saved on time, board and battens.
On another note, small lengths of twin and earth are annoyingly expensive.