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Wed 12 October 2016, 14:00 – 15:00 BST
Walk the Lines author Mark Mason talks about his travels round Britain for his new book Mail Obsession, in which he collected a fact from each of the UK's 124 postcode areas, all the way from AB to ZE. Along the way he discovered what the Queen keeps in her handbag and why the Jack Russell has a white coat. He visited the Harrogate hotel where Agatha Christie hid for eleven days and a bungalow in Kent that can't get a mobile phone signal because of the Second World War.