The London Mayor Boris Johnson has said stories that he is planning to be Prime Minister should be "knocked on the head".
During an argument with the London Assembly Chair Jennette Arnold, he laughed off a suggestion that he was "being prime ministerial".
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Transport for London is not happy that its branding has been used.
If you've been anywhere near Trafalgar Square today you'll notice something different.
Look closely at this collection of images by photographer Jim Grover and you'll notice there's something missing.