Did they turn up? Unfortunately not. At least Sienna Miller had the good grace to send her apologies - even if she seemed a little confused about the nature of the event: "I am sorry that I cannot attend your West End opening," was her excuse, read out to the crowd by Trevor Averre-Beeson, head of Salisbury School in north London.
But Gemma Arterton, the St Trinian's actress, was happy to join the party. And the paparazzi had their moment when Andrew Lansley, Tory health spokesman, made an appearance. Who needs Sienna?