Three London friends are preparing to run 39 marathons in just 30 days, across nine countries in eastern Europe, to help the fight against child trafficking.
Rob Martineau, Tom Stancliffe and Guy Hacking told Nina Hossain why they were taking up the challenge.
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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.