Eighteen months and an estimated £80million spent in relaunching the Guardian to its new Berliner format this week were almost thrown away when, two weeks ago, a top secret package containing the entire collection of advertising, including the new masthead design, sent from their advertising agency and safely delivered by courier to…the offices of the Daily Mail. After one of the Guardian’s biggest commercial secrets had lain unopened at the front desk of one of their competitors from an hour, a rather embarrassed courier arrived to retrieve it.