Asif Kapadia, the director of documentary 'Senna' about the Brazilian motor racing champion Ayrton Senna, was one of the artists that contributed to the Secret Postcard Sale.
Here the former Royal College of Art student talks to ITV London about the experience:
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Arsenal managed to beat Everton at the weekend but it wasn't enough to finish in the top for the first time in Wenger's time at the club.
The entertainer was held for the murder of Stuart Lubbock, who was found dead in his swimming pool in 2001, but never charged.
Although the diamond was believed to be cut in the 19th Century, its history and how it arrived at the car boot sale is unknown.