Just a thought about the surveyor? Does it really matter what he knows, it only matters what he writes surely.
He has that BSc MRICS after his name, the court will take it as Gospel if it goes that far, add in the adhesive manufacturer and 3 "Tile Companies / Fitters (Time Served)".
This may be the wrong way of seeing it, but I am sure that's how it is.
"The Supply of Goods and Services Act 1982 says the bathroom must be installed with reasonable care and skill. The
standard required is that of any other competent member of the trade in question. Moreover, the installer must use materials that are of satisfactory quality and fit for their purpose."
You lot have answered the above about 100+ times I reckon.
I would be most surprised if a defence could even be submitted that would have much chance of success.
I do have a written Order / Quote / Contract.
However, I still don't really want to take that route unless it is unavoidable. Although it is looking that way.
He will get his letter, and hence his chance to put it right.