I had had a couple of quotes for the work to be done and Nigel from NTB came in with a decent quote and was very confident of what needed to be done.
The work seems to have done the trick so far, however the finish of the plastering isn't great and the work wasn't completed behind the radiator in the bay window. The back room wall is left with a visible line down the middle where the 2 pieces of plaster board do not match up and some of the joining mesh is showing through. The same wall developed 2 large circular marks on it. Nigel came out and reassured me that this was simply the adhesive used behind the board coming through. Since I have painted it the stains are still visible meaning a 3rd coat of paint is necessary.
As some other people have commented, I had to get rid of the waste myself, however I was informed of this before the work started.
I did find Nigel to be very polite and very good at communicating and the work was done quickly.