'A story of grief and loss but also of solidarity and hope'

MAT MacDonald, a hospital doctor and the campaign's original driving force, is now road safety commissioner for the West Midlands.

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He is a thoughtful, passionate presence throughout the film.

Speaking to Chaundler at his home while planning a new phase of the campaign, he revealed for the first time that it was a road tragedy in his own family that ignited his zeal to demand change.

His elder brother was killed by a motorist when Mat, pictured, was just five. The moment has 'shaped his life since,' he admits.