David and Margaret Hay, from East Ayrshire, only realised the problem after they decided to buy a new house last year. David and Margaret Hay, from East Ayrshire, only realised the problem after they decided to buy a new house last year. A devastated couple have been told their £250,000 house is “unsellable” due to spray foam loft insulation. David and Margaret Hay, ... [2744 chars]