As I said earlier they are cutting into new areas the redif will make a larger bore and remove original material, and they agree there is no guarentee that they won't induce more faults than they are trying to cure.
They did say something about the steel hoops but I can't recall offhand what it was - I will look it up later and come back and shout at you so you can hear me behind your fridge.
Is that why you haven't answered last 2 times I knocked at your door ?