Whitehead is a natural marathon runner but turned to sprinting because there was no marathon for him to compete in at the London 2012 Paralympics. He not only stormed home to 200m gold but also to a world record.
This charity challenge is also a million pound fundraising quest as he hopes to raise at least that amount - through donations and sponsorship of people who want to run alongside him - for the charities Sarcoma UK and Scope.
More top news
A new medication derived from cannabis could help reduce seizures in children with severe epilepsy - and is now being trialled in the UK.
Some hand-written notes in an ancient manuscript turned out to be the oldest piece of music for more than one voice ever discovered.
Wet weather is expected across most of the UK later as rain sweeps in from the west overnight.