I write this on ‘Blue Monday’, the day associated with winter doldrums, when holiday companies prey upon our sense of daylight deprivation, lack of exercise, divorce from life ‘out there’. It’s when I feel most like hibernating, so it was perhaps contrary to choose this time of year to travel 250 miles further north from my home in Perthshire’s heartlands. In Orkney this is the season of upended goalposts when empty frames stand on pavements as their swinging coffee signs are torn away by gales to announce a hiatus in hospitality. Days are defined by their extreme shortness. The sky…