Our reporter Sangeeta Kandola went to meet Chris Brittain and Beau Brown in September last year - best friends, both have cerebral palsy.
Beau, from Weybridge, recently received an operation in American to help him walk. Chris meanwhile, from New Haw in Surrey, is still waiting for enough money to be raised to pay for a similar operation.
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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.
The unfortunate officer was taken to a central London hospital for treatment and his condition is not life-threatening.