Hi Waterways - the information regarding the failure of Brodie's pre-cast system came from Quentin Hughes's research. I cannot comment on his sources - because I don't have them. As far as the info goes - there was only one other example built - a cottage ordered by Letchworth. Clearly some more research is called for as to what happened. It could have been equally true that builders as well as unions disliked the system as it threatened their livlihoods as well. I can quite imagine a few well-placed builders/developers having a word in councillors' ears telling them to have the idea dropped.