For Labour MP Cat Smith, Sunday will be her third London Marathon, yet she also has a few nerves. She says she is "fully diagnosing" herself with "maranoia" - the anxiety and fear that can hit a runner as marathon day approaches. "The last few days before you do the run you start thinking back to all the training runs and thinking 'maybe I should have done another one, or maybe I should've tried harder or worked harder'...
Thousands will be running the 26-mile-long route this Sunday (April 27) as part of the London Marathon. However, alongside the everyday people, there will also be a few famous faces among the 50,000 participants.