Mr. Martin Vaughan:

That is a hypothetical question. The point is we do not have evidence. We have had no other complaints about this issue. We do not have any evidence with which we can give an objective answer to the question. We are more than open to sharing evidence if anybody else has such evidence but it is a hypothetical question. It is clear my colleagues have confirmed in technical terms that this back-flow issue occurs but, in terms of the scale and the significance of that on the water quality, it is not really a matter for ourselves. We do not deal with the quality of the water. Perhaps if the committee brought in Irish Water, it could deal with that aspect of the matter, or the HSE, if it is a public health matter.