What I would like to know is the difference :-
1. Less accidents when people are coming home from work in the dark, when they have more time to make the journey.
2. More accidents when people are going to work and are ruled by the time they have to be in work.
If GMT is good enough for the international space station then it is good enough for me. We are not involved in a world war, there really is no necessity to shift the time about. Leave it at GMT I say.
Also by changing the time about it's rather like flying across time-zones, jet lag and all that.