Here’s the double-page spread on The Turnstone from The Ladybird Book of British Birds and their nests:
The book is entitled ‘British Birds’ but says:
The Turnstone comes to England for the winter, and to see one you must go down to the seashore.
There’s no mention of Scotland or Wales. I’m in Orkney, which doesn’t feel very much like Scotland to me, when I go down to the seashore and see a Turnstone:
This bird derives its name from the habit of turning over stones with its beak, to catch the insects and shell-fish that live underneath.
That is exactly what they are doing:
They are birds on a mission.