My local MP was kind enough to organise a visit of parliament. He mentioned an amusing annecdote. The tradition still is that when the Queen visits parliament, a senior MP is held hostage in Buckingham. He was chosen on one occurence and was waiting in a drawing room of the palace, in the company of a General. To make the conversation, he asked the general "what if something were to happen to her Majesty?". The general smiled and replied "don't worry, it will be very quick".