Not exactly a DIY question, but I (or more precisely my father) could do with a bit of advice.
About 18 months ago, my father decided to have the waste from the dishwasher diverted so that it drains into the soil stack. This was done due to a prior very long external drain that was prone to freezing during the winter.
Anyway, for a few days I've noticed a fusty smell in his kitchen plus lifting of the cushion floor, so I pulled the dishwasher out and discovered that the drain into the stack was not secured to the wall, and was pissing water due to the strain on the joints. In addition, as soon as I touched the piping, it literally fell apart and the remains can be seen at:
This work was done by a plumber that my father has used many times before, but given the standard of workmanship, what are the panels thoughts for next steps.
The damage extends to the cushion floor needing to be replaced, the carcass for the sink is badly swollen (and probably from brown water at that), and the plaster is blown on the wall. The state of the dishwasher is unknown at this time.
I've taken a few pictures for your perusal and comments: