A newly-discovered painting by an acclaimed Cornish artist has sold for £20,000.

The painting by self-taught St Ives artist Alfred Wallis is thought to show the Forth Rail Bridge in Scotland.

The Devon-born artist spent most of his life as a fisherman and his biographer, Matilda Webb, thinks he saw the bridge in 1894 – four years after it opened – when the St Ives fishing fleet sailed up and around the British coast.

William Summerfield, from London auction house Roseberys, said: “Wallis rarely painted Scottish scenes and this long-lost work, unseen for almost a century, is a remarkable example of his virtuosic sense of colour and mood.”