Mr. Se?n Armstrong:

The first question was on the 75,000 shallow retrofits. The Deputy was really asking how many will have to be revisited to achieve a B2 standard. The B2 level or the cost-optimal level is typically achieved with wall insulation, attic insulation and an efficient heating system. Where those units were cavity wall units, attic insulation and cavity wall filling was probably carried out, assuming they were 4 in. cavity walls. If they had a relatively new boiler, that would probably bring them to the cost-optimal level. If there were solid-wall dwellings, they would have only had attic insulation done. They would not have had external wall insulation installed. A lot of older local authority houses are solid-wall dwellings and will need to be revisited. It is a technical issue. Solid-wall dwellings would not have been retrofitted under the shallow retrofit programme and will need to be renovated under the B2 programme.