CB, thanks for that. This has been rumbling along since February 2013 (yes nearly two years!). Found out a lot in my research and now think the company as a whole, or possibly one of his operatives, has been 'short-changing' projects by not using all the stated materials (in my case less than half the stipulated adhesive - hence the failure). Apart from court claim to recover cost of getting it put right by someone else, I am now referring the evidence I have gathered to Trading Standards for thorough investigation. I'll chat more by personal message.
Edited by: Aussie Ed