The Met police will launch a major new crackdown on crime, disorder and anti-social behaviour in the West End later today.
The campaign, called Operation Trafalgar, includes an area with a bed in it to help worse-for-wear revellers sober up.
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The so-called cycle super highway from Westminster to the Tower of London is one of Johnson's flagship transport projects.
Sunday is expected to be the hottest day, with the mercury due to top 26C in London.
London Assembly Tory leader Andrew Boff claimed campaign tactics to undermine Labour candidate Sadiq Khan had damaged community relations.