Tanith pretty irrelevant comment when we are talking about Europe and "countries farther north than Scotland".
I haven't checked every single country but Norway, Sweden and Finland are further north and adjust their clocks. The Netherlands, France, Germany,
Belgium, the Czech Republic, Hungary all do. It's nonsense, as the poster who raised this point tried to do, to make out this is some weird British practice which no-one else does.
Iceland doesn't as it would be pointless. I've been in Reyjavik on midsummer day; adjusting the clock would achieve nothing.