A painting by one of Britian's best-loved watercolour artists that was "considered missing" for 82 years is to be put on display. 'Mackerel Sky' by Eric William Ravilious was sold to a private collector for 15 guineas in 1939. The current owner is loaning it to Hastings Contemporary art gallery for its Seaside Modern Exhibition. Curator and art historian James Russell said the painting reappearing was "exciting news for Ravilious fans". "This 1938 gem, Mackerel Sky, was consi