Dr. Ciaran Byrne:

We will take a stab at it at any rate. To be honest, we have not done it in that way. There are people out there like BERWOW, which looks at BER calculations. It is a really good point and suggestion but one of our real difficulties is that there is an objective and amorphous thing - a building - and there are also people, and how people use the building can vary wildly as well. It is therefore quite difficult to get into that ready reckoner space. Perhaps Ms Coyle will comment.