The A1 registration plate is a United Kingdom vehicle registration plate that was first issued in 1903. It has since had several owners and has been transferred between many different vehicles. While it was the first vehicle registration issued in London, it is not the first issued in the United Kingdom.

John Francis Stanley Russell, 2nd Earl Russell, known as Frank Russell, was a British nobleman, barrister and politician, the elder brother of the philosopher Bertrand Russell, and the grandson of John Russell, 1st Earl Russell, who was twice prime minister of Britain. The elder son of Viscount and Viscountess Amberley, Russell became well-known for his marital woes, and was convicted of bigamy before the House of Lords in 1901, the last peer to be convicted of an offence in a trial by the Lords before that privilege of peerage was abolished in 1948.