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£30 painting confirmed as John Constable original

3 September 2013 Last updated at 12:11 BST

A small, postcard-sized painting bought for £30 has been valued at £250,000, after experts confirmed it as an original work by John Constable.

Rob Darvell's father bought the picture as part of a 'job lot' at auction, passing it on to Rob in 2012. Rob began the process of trying to authenticate it, enlisting the help of Curtis Dowling, from TV series Treasure Detectives.

The painting's authenticity and value were revealed live on BBC Breakfast on Sunday.