John Craxton’s Couple by the Sea (Panorama Revisited), c.1950, measures 7ft 2in x 4ft 4in (2.18 x 1.32m) and is offered for £290,000.

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Continuing until June 8, it incorporates 50 previously unknown paintings and drawings, produced over seven decades, from the British artist’s estate.

Craxton was a great hope for British painting in his youth but in his later years, after moving to Greece, he kept much of his work to himself.

He spent 60 years overseas, living privately and painting the Aegean shore extensively. The assemblage of his art now on show demonstrates his range and fascination with mythology, Greek topography, Byzantine mosaics and various modern stylistic movements.

The Derring Street gallery’s show coincides with the British Museum’s Charmed Lives in Greece: Ghika, Craxton, Leigh Fermor, which runs until July 15.