General Election 2015 David and Samantha Cameron on the steps of number ten Downing Street. David Cameron gives his speach as PM Photo Sean Aidan 08/05/15

General Election 2015 David and Samantha Cameron on the steps of number ten Downing Street. Photo Sean Aidan 08/05/15

General Election 2015 David and Samantha Cameron on the steps of number ten Downing Street. 08/05/15

General Election 2015 David and Samantha Cameron on the steps of number ten Downing Street. Photo Sean Aidan 08/05/15

England, London, Olympic Torch relay in Downing Street, Samantha and Prime Minister David Cameron welcome the torch.

England, London, Olympic Torch relay in Downing Street, Samantha and Prime Minister David Cameron welcome the torch.

England, London, Olympic Torch relay in Downing Street, Samantha and Prime Minister David Cameron welcome the torch.

England, London, Olympic Torch relay in Downing Street, Samantha and Prime Minister David Cameron welcome the torch.

England, London, Olympic Torch relay in Downing Street, Samantha and Prime Minister David Cameron welcome the torch.

England, London, Olympic Torch relay in Downing Street, Samantha and Prime Minister David Cameron welcome the torch.

England, London, US Republican Presidential hopeful Mitt Romney addresses journalists outside 10 Downing Street after visiting Primeminister David Cameron.

England, London, Westminster, Whitehall, Downing Street, Security gates and armed police guards,