Just for the record, it's finally all sorted now. TBH, we didn't come off that bad in the end, fortunately, with a total bill of £2480 across both engineers. (We ended up paying the first guy in full rather than arguing over it, just to get this whole ordeal over and never have to deal with him again). The second guy who came and fixed this mess was actually really good and I will continue using him in the future. His initial prices were very high as he didn't know exactly what he was walking into, so had to give a rough price for a worst case scenario.
There was only a further delay with finishing the hole in the roof because the first guy had put the flue through in a position immediately next to both the chimney stack and ridge tiles, so we had to wait until our roofer was here carrying out some other roof repairs and could remove the ridge tiles to get the flashing slate in.
Lesson sorely learnt.
There was only a further delay with finishing the hole in the roof because the first guy had put the flue through in a position immediately next to both the chimney stack and ridge tiles, so we had to wait until our roofer was here carrying out some other roof repairs and could remove the ridge tiles to get the flashing slate in.
Lesson sorely learnt.