Mr. Michael Gillespie:

The Health Protection Surveillance Centre has recommended these devices in a report. They are a cheaper method than installing heat exchange systems or anything more sophisticated than that because the cost might be prohibitive. We should have been looking at this years ago, even for energy efficiency reasons.

On the space for schools, we were given an extra allocation in post-primary schools. What is happening is that communal areas and parts of gyms are being used as classrooms because we started with the biggest classes in Europe and that is what we had to do. We should not have been starting there; that is the biggest problem.

At post-primary level, unlike at primary level, the problem is subject-specific. We might get a substitute teacher but he or she will not be in the same subject. The scarcity of teachers is, as we said, partly to do with the two-tier pay system. Certain teachers have transferable skills so they can go into the private sector or whatever and they are not entering teaching. That is part of it. We may have substitutes but they are not subject-specific.