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 robbers casually approached their victim on a busy high street before before spraying a noxious substance in his face.
Tencho Hristov ignored warnings and got trapped between barriers at Roydon in Essex.
The 6km bike track will include 130m of the South Circular near Kew Bridge.