Maple Lodge,
You have a personal message.
The website you looked at
www.abadbett.com is just a banner site. The main website
www.agladedalenightmare.com is over 50% complete and contains a significant amount of information about the problems with mine and others properties, correspondence with regulatory and legal bodies, an in depth look at how developers actively remove what few rights buyers have and much much more. The case study is Bett Homes / Gladedale but the information presented applies to many of the larger house-builders.
Back to your own situation. Are you relying only on investigations by the NHBC? Remember that the NHBC is the builder's insurer, but you are paying for that insurance. There are very few in the NHBC that I have met who have any real idea on what they are talking about. Better to employ a professional in a dispute situation.
Outside Scotland the NHBC can have a Building Control function but you will probably find that the local authorities take on building standards is vastly different from the NHBC's. How can the NHBC say that a property is constructed correctly when an independent structural engineer, surveyor or whatever clearly reports that it has not been constructed correctly. The answer is because the NHBC warranty only lasts 10 years so they don't care if it falls down after that. It is all about risk - if there is a possibility that something will go wrong in the first 10 years and they will look bad, then they will do something about it, if not they won't bother. Bit of a scam really.
www.abadbett.com