Energy Saving (Daylight) Bill

The emphasis on the whole issue of climate change and energy-saving opportunities is welcome. My hon. Friend referred earlier to savings suggested by the previous experiment between 1968 and 1971 and suggested that the contact between the hon. Member for South Suffolk (Mr. Yeo) and the National Grid Company indicated similar savings. However, we must bear in mind that we are now almost 40 years on and demand is comparatively much greater, so would the saving be as great in percentage terms as it was deemed to be in the past?