The oil on wood painting by Eramus Quelliness II was taken in a raid in 1979, though the thieves left behind much more valuable works

The Liverpool-born sculptor's 50-year engagement with organic, layered, forms works in natural harmony with the Yorkshire treasure house and its Arcadian grounds

The portrait scandalised viewers when it was painted in 1957

Almost 60 works by artists including Rembrandt, Annibale Carracci and Sebastiano del Piombo will go on show at the Millennium Gallery