We face south-west towards the Isles of Scilly. To our left is a coastal hill, Carn Gloose. On our right is Cape Cornwall and beyond, exactly a mile offshore, I’m told, is a series of rocky outcrops known as the Brisons. In Priest’s Cove we hop from boulder to boulder towards a series of larger, weed-mottled granite monoliths. They stand closer to the tide edge and offer us a perfect view of the incoming tide.