The team delve into the world of music memorabilia when they investigate a piano linked to John Lennon and a guitar with a connection to Ronnie Wood, but are they the real deal?

A sculpture found in the long grass of a Norfolk home bears striking similarities to the work of Henry Moore. Could it be a lost work by one of the greatest 20th-century artists?

The team try to find out whether a white square of plaster is an early work by Giacometti.

Fiona Bruce and Philip Mould investigate a delicate sketch depicting a mother and child, purported to be by one of the modern art world's most famous names, Amedeo Modigliani. Its owner, Henrietta Sitwell, inherited the work and always believed it to be genuine. However, a leading auction house recently cast doubt on its authenticity. If the work is genuine, it could be worth up to £100,000. If not, just a few hundred.

Fiona Bruce, Philip Mould and the team help Americans Kim and Chuck, who believe their landscape painting is by one of the founders of Impressionism, Alfred Sisley, building a case to prove its authenticity. Kim and Chuck bought the work at auction near Chicago and believe it to be genuine. However, the painting was turned down nearly 10 years ago by the authentication committee, so the team will have to find new evidence to persuade them to change their mind.

Could a mysterious canvas covered in white paint be hiding a lost painting by one of the most important painters of the 20th century, Armenian-American artist Arshile Gorky?

A mysterious inscription, a famous name and a colossal price tag. The team embark on a high-stakes quest to authenticate a 'lost' Churchill. Is it genuine or a clever fake?

The team investigate a powerful scene of the aftermath of battle; could it be a work by celebrated Victorian artist Edwin Landseer, thought to be destroyed by a flood in 1928?

Fiona and Philip examine a painting that owner Patrick Rice thinks is by Edgar Degas. If its genuine, it could be worth about £500,000. They trace the artwork back through time to find out whether it really was created by one of France's greatest artists.

This week the focus is on Britain's public art collections, in which 17,000 paintings are listed as `artist unknown'. Philip identify several works they believe are by Thomas Gainsborough.

Fiona Bruce and Philip Mould must prove that a sketchbook is the work of a young Toulouse-Lautrec, overturning a decision made by a committee of experts on the artist. The drawings in the book are of a very different subject matter to Lautrec's famous works, and are dated to when he was a teenager - a period of his life that is largely a mystery. To get to the truth, Fiona and Philip travel to the town in the south of France where Lautrec grew up and visit the grand family home where he spent much of his youth.

A painting bought from an online auction in Monaco described as 'in the style of Sir Joshua Reynolds' looks promising, but could something murkier be lurking beneath the paint?

Nicky Philipps needs help in determining whether a mysterious painting housed at Picton Castle in Pembrokeshire is a genuine piece of work by French Impressionist Pierre Auguste Renoir.

Fiona and Philip attempt to help Under-Sheriff and Secondary of London Charles Henty find out whether two paintings in his possession are as valuable as he believes.

A sketch of a dancer believed to have been drawn by Auguste Rodin is investigated.

The team examine two pictures believed to be by Paul Gauguin, a giant of 19th-century art.

The team investigate an 18th-century landscape that could be a lost work by of one of the biggest names in British art, Thomas Gainsborough.

Fiona and Philip visit a church in Port Glasgow to investigate whether a mysterious work depicting Christ after the crucifixion could be a lost masterpiece by one of the great painters of Northern Renaissance art.

Could two simple sketches be by great French artists Pissarro and Cezanne? The team set out to gather evidence to prove they’re genuine.

Fiona and Philip take a look at the history of three paintings bequeathed to the National Museum of Wales after their owner died in 1951. It was always thought that the paintings were by landscape artist JMW Turner, but only months after the museum took ownership, experts said that they were fakes.

Fiona and Philip attempt to prove that two paintings are missing works by one of the country's best-loved artists, John Constable.

Featuring works claimed to be by Willem de Kooning, Philip Mercier and Adolph von Menzel.

Fiona Bruce and Philip Mould investigate a small watercolour sketch that could be the work of sculptor Henry Moore. The piece was found in 2012 in a hoard of artwork stolen by the Nazis. While the unidentified piece has many characteristics of Moore's work, none of the other artworks recovered were by British artists, so it remains a mystery how it came to be there. The team must not only find out who created it, but also who it belonged to, since it may have been looted from Jewish owners during the Holocaust and will need to be returned to surviving descendants.

The team investigates a beautiful 18th-century Venetian view. Could this be a work by one of the Italian masters - either Francesco Guardi or Michele Marieschi?

When Ian and Julie moved into their Surrey cottage nearly 20 years ago, they discovered a curious wall painting in one of the bedrooms. They had no idea who put it there. Julie wanted to get rid of it as it didn't match her decor plans, while their four-year-old wanted to colour it in with her crayons.