Forgotten art treasure found on palace shelf
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Thomas Gainsborough sketches discovered at Windsor Castle

It took one historian's house move to make the art discovery of a lifetime.

Lindsay Stainton was sorting through photos when she realised one of them, sent to her decades earlier by a curator at Windsor Castle, showed a sketch by Thomas Gainsborough.

This is how 25 hidden sketches by the famed landscape artist were found.

Video journalist: Alex Stanger

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