We had Loft insulation and Cavity wall insulation carried out by them and were quite satisfied with the work, other than one of the guys replaced an interior air brick vent cover with a new plastic one and instead of using plugs and screws, I discovered after they had gone that he had use white silicon sealer and stuck it straight onto the wall paper.
Next time we papered we would have pulled it off when stripping the old paper off, so I phoned them and the next day a chap came and cut the paper just on the edge of the cover and fitted a new one using plugs and screws.
Just one slipshod bit of workmanship spoilt an otherwise good job, and I don't think he got away more than ten seconds earlier by scrimping on the job.
dave