In other Nick Clegg news, a document outlining the Lib Dems strategy for the next TV debate has come to light after it was left in a taxi by an aide. Although most people find it perfectly possible to remember their possessions when they get out of a vehicle, a surprising number of important items have been left in taxis over the years:
• Gordon Brown's adviser left notes covering everything from the expenses scandal to his boss's makeup requirements in a London taxi last May.
• In 2008 musician Phillippe Quint got out of a New York cab without his 285-year-old violin worth $4m; he was so relieved when the driver gave it back that he thanked him with a private concert.
• Earlier this year New York cabbie Mukul Asadujjaman drove 50 miles to reunite holidaymaker Felicia Lettieri of Pompei with $21,000, plus jewellery and passports.
• Roberta Flack spent a year working on a Beatles tribute album called Let It Be Roberta, only to leave the recordings in a taxi. She rewarded the driver with a "huge tip" when they were returned.
