London Mayor Boris Johnson on the Andrew Mitchell row:
"In my book you shouldn't abuse police officers and I made that clear loads of times. The crucial thing for me is that Andrew Mitchell has now apologised not just once but twice publically. I believe he's also apologised to the officer concerned."
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Five activists were arrested after staging a three-hour demonstration which forced the closure of a tunnel at Heathrow Airport.
Those vying to be named the new Met Police Commissioner will speak to the Home Secretary, London Mayor and Policing Minister.
Monday's temperature was recorded at Kew Gardens, west London, where visitors enjoyed temperatures 10 degrees warmer than Milan at 8C.