Gadd, Jamie Bell, Stuart Campbell and Mitchell Robertson star in a tale of stepbrothers who spend decades on a destructive, and self-destructive, journey.

I first encountered Richard Gadd in 2016. He was clad in pink lycra and running on a treadmill for the whole hour of his Edinburgh Fringe show.

A violent altercation at Niall's wedding kick-starts the new series, which cuts between the 1980s and the present day to explore how their relationship fell apart.