Portrait of Olivia Boteler Porter which London dealer Philip Mould recognised it as typical of Van Dyck’s female portraits of the 1630s. Image © The Bowes Museum

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Last year he identified three previously overlooked 17th century paintings as being the work of Van Dyck, and the Your Paintings website was vital in finding one of them.

The work in question had been sitting in a storeroom at the Bowes Museum in Barnard Castle, County Durham, and was thought to be a 19th century copy "After Van Dyck, Portrait of Olivia Porter", but Mr Mould linked it to two others after seeing it on Your Paintings.

Despite clouded varnish and some poor restoration, he recognised it as typical of Van Dyck's female portraits of the 1630s when he was in England.