The right hon. Gentleman has wonderful timing; I was just coming to the points that he made. He made some very good points, particularly—if I may say so—about town gas. He is quite right, and the hon. Member for Southampton, Test made this point as well, that the transition from town gas to natural gas that happened in the 1960s and 1970s was a whole-country endeavour. He is also right to point out, as I think the hon. Member for Southampton, Test also did, that town gas was largely composed of hydrogen. So in a way, having hydrogen in the gas network is not so novel an idea; it has happened before. Of course it was a much dirtier gas then, but hydrogen as the basis of a heating system is something that we can certainly achieve.
The last thing I will say before I conclude—