Mr. Damien Owens:

I can start and then my colleague can come in. Much of the deleterious material currently being discovered through sampling and testing relates to properties that were constructed many years ago. The provenance of some of the materials may perhaps never be known. One thing that has improved the situation is the Building Control (Amendment) Regulations 2014. They introduced a chain of control for all the materials used in the construction of properties and how they are deployed. We cannot speak about the past but certainly from 2014 onwards properties are constructed, there is a chain of control and quality control there. Mr. O'Connell may be able to-----