God save the Queen: the monarchy has become more valuable than ever

Rarely has a public figure taken a promise so seriously as the vow that Her Majesty the Queen made on her 21st birthday in 1947: ‘I declare before you all that my whole life – whether it be long or short – shall be devoted to your service.’ Predictions that she would take the occasion of her 60th, 70th, 80th or 90th birthdays to retire and enjoy an easier life have proved laughably wide of the mark.