The Intruder(1972)

series - first aired/released 1972-01-02 - audience 7.5

Arnold Haithwaite is a sand pilot. He pursues his strange and solitary profession on the sands of Cumbria, beside the Irish Sea. A sand pilot, like a sea pilot, must know his way about; he must have a strong sense of locality and identity. But now another figure haunts this strange landscape: a sinister intruder who claims to be the real Arnold Haithwaite...