Labour's Foreign Secretary David Miliband MP, speaking on a London elections campaign walkabout in Palmers Green, said:

"I have visited over 20 countries in the last nine months as Foreign Secretary. In each and every one London is a source of admiration and sometimes envy. Over the last ten years it has come to stand for something simple: the one to beat. In terms of its economy, its culture, its people, its daring, its resilience, it is world class. That doesn't happen by accident; it takes leadership.

"Ken Livingstone has provided the vision that has helped London reclaim its place as the number one international city. From climate change to financial services to the Olympics, London is setting the global goals and pursuing them. And critically London is moving forward not standing still.

"The best thing about Ken Livingstone is that he is restless for more change not satisfied with the status quo. He is passionate about building on the progress he has helped to create.

"Boris Johnson may be bored on the backbenches but London is a great international city not a toy. London needs strong leadership from Ken Livingstone not entertainment for Boris Johnson. It has taken ten years to put London at the top of the international leagues. It is vital that the next ten years do not fritter that away."