Special edition of the history magazine show presented by Dan Snow and Sian Williams. Filmed at Westminster Abbey, the programme celebrates the Queen's diamond jubilee by looking back at more than a thousand years of royal history. They're joined by special guests Twiggy, Larry Lamb and Lucy Worsley. Fashion icon Twiggy discovers the rules of dressing the Queen, in conversation with royal designers and milliners. Larry Lamb revisits his childhood in the 50s to find out why vintage is such big business. Historian Lucy Worsley draws parallels between the London of 1897, when Queen Victoria celebrated her diamond jubilee, and the preparations for this year's celebrations. Dan Snow continues his history road trips with The One Show's resident hairdresser, Michael Douglas, to discover how a king called Ken is related to our queen, and what happened when we experimented with doing away with the monarchy. In the abbey the team are joined by some of the choristers who sang at the Queen's coronation. They also discover some of the secrets of last year's royal wedding with the dean of the abbey, and find out how they keep their priceless treasures looking their best for the more than one million tourists who visit each year.