The Director of Public Prosecutions Keir Starmer QC has refused to consent to the private prosecution of terror suspects Babar Ahmad and Syed Ahsan.
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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.
The Central and Waterloo and City lines will be affected, with other stations and lines likely to be busier than normal.