The Lighter Evenings (Experiment) Bill seeks to replicate the experiment conducted in 1968-71 into the effects of single/ double summer time. For those years the clocks were advanced in March 1968 and not put back until October 1971. The research found that when British Standard Time (GMT+1) was employed all year round around 2,500 deaths and serious injuries were saved each year of the trial period. A PACTS briefing note is available.
For additional information, please also see the RoSPA briefing on this subject or the TRL research paper.