On 22 March 2017, 25-year-old Will Dyson was walking along Westminster Bridge, when a vehicle mounted the pavement and hit him from behind. The Terror Attack left five people dead and more than 50 injured. Will was one of the injured.

In the lead-up to the year anniversary, producer Georgia Catt followed Will as he faced up to his changing views of the incident. She also witnessed him receive the devastating news that his doctors weren't happy for him to take part in the Hackney Half Marathon, a long-held personal goal.

Three years later Georgia meets Will again to find out how life has been in the intervening years, and watch him finally taking part in the Hackney Half.

Produced by Georgia Catt and Ellie Bury