One thing I notice as a Brit living in Barcelona, look at it on the map. The majority of Spain is west of Grenwich meridian. Yet the clock is set an hour forward of GMT. So if you are going to bed here at 1am, then in the UK it will be still be 12am, yet most of Spain will have more light.
At the end of the day its just a number, as most of you will probably have it shifted by an hour a couple of times a year.
