Campaigners against the so-called "bedroom tax" stepped up their efforts today to have the policy repealed. Hundreds of people gathered in central London to mark one year since the benefit changes came into law.
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The mayor said a post-Brexit visa system was needed to maintain the supply of skilled migrant workers for London's economy.
Peter Barnett made hundreds of trips from his home in Oxfordshire to Marylebone station without paying the full fare.
Police say he may have attacked more children and urged them to come forward.