Druridge Bay is enveloped in the dispiriting coastal fog of a typical Northumberland sea fret, but as we wander across the beach to meet the water, coils of cloud break apart and a milky sun breaks through. I wade into the shallows and a small flounder suddenly appears from its perfect sandy camouflage, as if decloaking from an invisibility shield, and darts rapidly away.
Beyond the shore are lively flocks of black-headed gulls, oystercatchers and gannets, some only heard in the fog; but we do spot a small flock of the world’s greatest travellers.