Each of the United Kingdom's 124 postcode areas has a story to tell, an unexpected nugget to dust off and treasure. Mark Mason has embarked on a tour of the country, immersing himself in Britain's history on a roundabout journey from AB to ZE. On the lookout for interesting place names and unusual monuments, along the way he discovers what the Queen keeps in her handbag, why the Jack Russell has a white coat and how Jimi Hendrix got confused by the M1. He visits the Harrogate hotel where Agatha Christie hid for eleven days, a bungalow in Kent that can't get a mobile phone signal because of the Second World War and the grave of a Scottish duke whose legs had to be cut off so he could fit in his coffin. At the same time Mason paints an affectionate portrait of Britain int he 21st century, from aggressive seagulls in Blackpool to 'seasoned' drinkers in Surrey. And his travels offer the perfect opportunity to delve into the history of the Royal Mail, compete with pillar boxes, posties and Penny Reds - plus Oscar Wide's unconventional method of posting a letter. A charming mix of fact, anecdote and overheard conversation, Mail Obsession plays homage to Britain's wonderful past and its curious present.