In 1999, when I first visited Shetland, I was presented with a certificate confirming that I had been farther north than 60°; it was a marketing ploy, but I was pleased to receive it – and still have it. Latitude, clearly, was anything but a geographical platitude to these people of the far north of Britain, closer, as they are, to the Arctic Circle than they are to London, and on a level with Hudson Bay in Canada, St Petersburg in Russia, Stockholm in Sweden and Helsinki in Finland.