I don't know if you have come across this.
I enquire and arranged, through my energy company, for my house to be surveyed for wall insulation. (if your on a benift such as DLA you are entitled to it)
The first time (yes sorry I have tried 4 times and had my house surveyed each time).
The first time when the workmen arrived they said I hadn't enough air vents in the out side walls and they could do it for cash.
Luckily I was aware of the place they indicated and pointed out to them that it didn't need them because in that part of the house it was a solid floor.
Well I told them I would sort it and sent them on their way.
The next two both said that because I had a conservatory that the rear bedroom wall couldn't be done.
I found it questionable especialy as one of them never even went out side and checked.
I asked the energy company for another oppinion.
Yesterday a gentleman surveyed my house and said there are no problems they had conservatory ladders especialy for the job.
I know it sound I'm being difficult but it will be the only time so I wanted it wright.
So if you have a conservitory and are told that your house can't have the full house done because of the conservatory, don't except it because it can.