Daylight saving was introduced, I believe, during World War 1 to aid the factory war effort. I have never understood what the benefit is - the amount of daylight doesn't change because of it, it just swaps dark early mornings for dark early evenings. Many workers who have to start early or catch a commuter train would not notice a difference.
However, we are now back to GMT and that means a lot of homebound driving in the evenings, although night-time journeys only account for 20% of journeys. Yet they account for 40% of fatal accidents - glaring oncoming headlights, poorly marked country roads combined with tiredness etc. So if you are one thecommuters plunged into darkness for the trip home, take exta care.