Britain's Lost Masterpieces - Episode Guide

The Swansea museum store contains everything from a stuffed pigeon to a police car, but can Bendor and Jacky reveal a multi-million pound lost masterpiece that will not only become a jewel of Swansea museum's collection, but also re-write art history?

Also in this episode, a rare appearance at the museum of a giant painting of local coal miners prompts Jacky to re-examine the life of the man who painted them, the renowned Polish artist Josef Herman. She tracks down those who remember him in South Wales.

Haddo House is one of Britain's most northerly stately homes. Tucked away in the wilds of Aberdeenshire, it has been home to Prime Ministers and earls - but is it also home to some of Scotland's greatest lost paintings?

Nearby, in the storerooms of the Montrose Museum, lies a mystery painting with a giant hole in it. The portrait shows Richard Mead, the patron of one of Scotland's most celebrated painters, Allan Ramsay. According to the history books, the painting is a copy of a painting in the National Portrait Gallery in London. But has there been an unfortunate mix-up, and is the painting in London in fact the pretender?

Dr. Bendor Grosvenor and Jacky Klein visit the Ulster Museum to investigate what have long been disregarded as low-value copies of works by Flemish artist, Peter Breughel the Younger.

They also visit the Northern Ireland Assembly at Stormont, in which a controversial painting once slashed with a knife is now kept in a room away from public view. The subject is believed to be William III and the Pope - these two characters in one picture would be guaranteed to rouse the passions on both sides of the sectarian divide. But has the painting been a case of mistaken identity? Bendor and Jacky investigate.

Pollok House is a country house right in a Glasgow city park, owned by Glasgow City Council and looked after by the National Trust for Scotland. It has a collection of Spanish art, the legacy of the man who once owned the house, Sir William Stirling-Maxwell. Unfortunately, some of its treasures have been placed in storage due to a leaking roof and renovations. But could one of these displaced pictures be a priceless lost work by Rubens? The painting's subject is George Villiers, Duke of Buckingham, the gay lover of James VI of Scotland. While Bendor squares up to a rival portrait in Florence which claims to be the real Buckingham portrait by Rubens, Emma finds that Stirling-Maxwell had a secret family in Jamaica and that sugar and tobacco built Glasgow long before shipbuilding was its major industry.

Along with a hippo skeleton, a stuffed hedgehog and a log boat, Derby Museum has the best collection of Joseph Wright of Derby paintings in the world. Wright of Derby is one of the greatest English artists who ever lived. He painted the most astounding ‘birth of science' scenes, his landscapes and portraits are exquisite and he was inspired by the Industrial Revolution.

But can our team peel back layers of modern restoration on a mysterious landscape painting stuck in the Derby vaults to reveal another hidden masterpiece by Wright of Derby?

Carmarthenshire County Museum is a slice of history in itself. The building that houses it has been in continuous use since the 13th century, once a Bishop's palace it was where the Bible was first translated into Welsh. But could it also be home to some mysterious cases of mistaken identity and two lost paintings from the time of Charles II?

Dr Bendor Grosvenor and Emma Dabiri travel to Carmarthenshire to investigate two intriguing portraits of a local nobleman and his wife, the Earl and Countess of Carbery, possibly painted by the great Sir Peter Lely in the 17th century.

Yet all is not as it seems: Bendor has a hunch that one of the portraits is by another hand. Could the portrait of the Countess be a lost work by Mary Beale, Britain's first commercially successful female artist?

While Bendor gets to grips with the badly damaged portrait of the Earl, Emma traces the story of how he survived the Civil War, how Mary Beale was written out of the history books, and discovers how the cross-dressing men of the Rebecca Riots stormed Carmarthen.

Hospitalfield House in the fishing town of Arbroath on Scotland's east coast is a Victorian treasure trove.

The couple who owned this great house back in the 19th century were obsessed with the decorative arts, and Hospitalfield is full of ornate carved ceilings, sculpted fireplaces, exquisite plasterwork and stonework carved by master masons. It's still a place where artists work today and it has a fine picture collection.

Among the many Victorian paintings, could a mysterious 16th century portrait by one of the great Old Master artists lie waiting to be discovered?

In Knightshayes Court Devon the team are examining a work that is a copy of a Rembrandt. But, might it be the real thing, a genuine self-portrait?

At the Manchester Art Gallery, Dr Bendor Grosvenor discovers a painting of a country gentleman from the 1770s which he believes has been misattributed to Nathaniel Dance. He feels sure it is in fact by the German painter Johann Zoffany, a favourite portraitist of the royal family under King George III. While the painting is restored, Bendor investigates the life of Zoffany - a chancer and adventurer who squandered his royal patronage through a series of predictable errors of judgement.

Dr Bendor Grosvenor investigates two paintings found at Petworth House in West Sussex, while Emma Dabiri explores the life of one of its owners, the third Earl of Egremont.

In Oxford's Bodleian Library, Dr Bendor Grosvenor spots a finely painted portrait by an unknown artist. Could it be by the greatest portrait painter working in Rome in the 18th century, Pompeo Batoni?

Bendor Grosvenor finds two anonymous planks in a drawer at Birmingham Art Gallery. Put together, they show a scene of village life. Is he right in detecting the hand of Flemish master Brueghel?

In Cardiff Art Gallery, the experts investigate a badly overpainted Madonna. Elsewhere, Dr Bendor Grosvenor travels to Florence to explore the early Renaissance.

Bendor Grosvenor and Emma Dabiri visit Brighton Museum to investigate who painted two religious pictures, and uncover the story of an extravagant building.

Bendor Grosvenor and Emma Dabiri travel to Georgian mansion of Tatton Park in Cheshire, where Bendor has spotted a mysterious portrait of a 16th-century physician in its collection.