You can't say - it would be significantly worse for everyone in the North - then say, in the next sentence, an extra hour in the evenings for a few weeks a year might make an improvement.
The total amount of daylight stays the same.
Ergo your significant nightmare for everyone of dark mornings - will last a few weeks only.
Scottish people will have a few more weeks of darkness and a few more weeks of extremely late sunsets. Most of my Scottish friends feel that one of the advantages of living up there are the endless summer evenings.
I suppose logic would put England on CET and
Wales and Scotland can do what they want, since they have have their own Parliament and we subsidise them to do whatever they fancy