In other news…there is a fresh round of speculation that Kate Middleton might be expecting a baby tonight after  Conservative MP Claire Perry told a group of 250 schoolchildren that she thought the Duchess was pregnant.

Perry made the comments in front of 250 people at Marlborough College - Kate Middleton's former school in Wiltshire - during their Summer School Question Time debate

Ms Perry said: 'I think Kate Middleton  is pregnant – and that would be good for the economy', the Daily Telegraph reported.

Royal historian Hugo Vickers told the Telegraph that  Mrs Perry might be “trying to make a bit of a name for herself” by making controversial comments, adding: “Unless she has visited the same gynaecologist it strikes me as extremely unlikely she might know.”

He said: “It’s quite clearly none of her business to make remarks of that kind, and presumably it is not very helpful either."

Royal observer Ingrid Seward said: “It’s very unhelpful for her to say that. She would have no insider knowledge.

“It will be the best-kept secret of all time. There is no way they would want people to know before it was appropriate.

“Historically there has always been speculation about this sort of thing, and of course you cannot stop people saying what they want.

“I should think the Duke and Duchess of Cambridge are probably pretty used to it but also pretty fed up with it.”

She added the prospect of the Duchess of Cambridge being pregnant was “highly unlikely”, pointing out the Royal couple are scheduled for an overseas tour as part of the Diamond Jubilee celebrations later this year.