He started his television career on the BBC in autumn 2008 with What to Eat Now, a cookery programme based on his book of the same name.
His parents were Simone Georgina de Ferranti (née Nangle) and the diplomat Frederick Warner, who was British Ambassador to Japan from 1972 until 1975.
He worked in London restaurants for eight years under chefs such as Alastair Little and Rose Cararina, before setting up a private catering company, Green Pea.
He presented Valentine Warner: Coast to Coast (Good Food), in which he travelled the country fishing and cooking his catch, as well as Ration Book Britain (Yesterday) and Valentine Warner Eats The Sixties (Yesterday).
Warner is one of the founders of the Moorland Spirit Company who make Hepple Gin in Northumberland.