h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

And Another Thing.....
The length of the day in Thurso has nothing to do with daylight savings time! In summer, you get a 20(ish) hour day no matter what 'time' sunrise is at - whether you watch tells you it is 4am or 3am.

Daylight saving time is actually a winter time setting, which meant that when it if 'really' 5 o'clock at night and rather dark, the time change means your watch is set to 4o'clock and you've still got an hour of light left.

You're partly right, and very wrong.

The wrong first:
Daylight Savings Time is a summer thing. In summer you'll have the sun due south at 1pm, in winter it will be due south at noon, as it 'should' be.

And the partially right: You have the same length of the day, and the paragraph does indeed appear to give to much credit to DST, and it does say: Due to daylight saving time, the summer days in Thurso last much longer than someone from the south would expect.
But who knows how people from the south think, maybe they calculate sunset from the latitude and time of year, and are surprised when it doesn't set until an hour later (making the day last longer)?