I can add another name although my experience with them was at least 10- 12 years ago. I was involved in a claim by a purchaser against McCarthy and Stone – Builders of retirement flats and apartments. Fire stopping was missing in the roof void of a second floor flat, also the service pipe ducting in the bathroom (behind the bath).
I also encountered a problem in a nearly new 2 bed terraced house of gaps in insulation resulting in cold spots on the ground floor – the owner complained the house was costing more to heat than a 70s built 4 bed detached she had moved from.