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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The ducks held up traffic between Junction 18 and 19 near Watford.
Met Police say they are working in 'challenging' circumstances but insist they are doing their best with the resources they have.