I will, but I am afraid I will have to disappoint my hon. Friend.
I am on record as stating my ambition, which has also been mentioned in the debate, of seeing up to 20 GW of solar deployed in Britain, building on the terrific 2.5 GW we have deployed since the coalition came to power. Let me put that in context: if we converted only 16% of suitable commercial and industrial rooftops, or only 8% of suitable roofs on our homes, or a mix of the two, that would be sufficient to meet my big 20 GW ambition.