Will, who takes up the new role in July, has been at the BBC for more than 12 years in a variety of roles, including senior political producer for Andrew Marr. He has also worked for ITN, GMTV and Granada.

Boris said: "He will bring drive, originality and flair to the post of director of comms. It is ever more vital that politicians communicate clearly and honestly with voters about how we are spending their money and how we plan to improve the city.

"I believe Will has exactly the right skills to help us engage with Londoners. He has enormous experience of politics and a great track record at the BBC. I am thrilled to welcome him on board."

Will said: "After 12 year fantastic years at the BBC, I'm delighted to be joining Boris Johnson and his team at what is an incredible time for London and for Londoners. A Diamond Jubilee and an Olympic Games represent among the very best that London has to offer.

"But I know that the Mayor is determined it doesn’t end there. He has set out a compelling vision for London's future and it is a privilege to be asked to help shape that vision."

Will’s appointment follows the departure of Guto Harri, who has joined News International as director of comms.