Dr. Ciaran Byrne:

We have done projections out to the end of the year and we have also looked at the B2s and the non-B2s, and there is a B2-equivalent because the target is actually a reduction in CO2 emissions. We have to move from approximately 7.5 megatonnes of CO2 emissions now to 3.5 megatonnes of such emissions. The B2 is a pathway to the target. Not all homes may get it to a B2 standard. For example, in the BER rating scale, if a home that is currently at the bottom of that scale has a G rating and it is brought up to a C3 rating, that will have abated quite a significant amount of carbon but it has not reached a B2 rating. We will be looking to blend those two together where we may not get every home up to a B2 standard, albeit that we have a B2 target, but we will be looking at the carbon saved. This is ultimately about the savings in CO2 emissions.