He returned to full time painting in 1946 living in Buckinghamshire, later moving to Broadstairs in Kent where the coast and landscape provided artistic inspiration.
In 1954 with his wife and son, Peter, he moved to an old farmhouse in the South Hams.
A painter in both oil and watercolour, and a printmaker, his subjects concentrated mainly on Westcountry landscapes and coastline as well as country shows. He also painted villages, mountains and the countryside of Spain, Portugal and Italy.
Mr Grieg was a Fellow of The Royal Society of Arts; was elected to membership of The Royal Society of Marine Artists, and in 1966 was awarded a Gold Medal at The Paris Salon.
He also exhibited at The Royal Academy, The Royal West of England Academy, The Royal Institute of Painters In Water Colour and The New English Art Club, among others.
Many of his paintings are in both private and public collections at home and abroad, including The National Maritime Museum, Greenwich, Scunthorpe Municipal Galleries, and he also exhibited regularly at The Royal Society of Marine Artists, Mall Galleries, London.