Robertson is also known for his work in the long-running children's drama Grange Hill and The Debt Collector, also starring Billy Connolly.
Robertson featured in Steven Spielberg's Band of Brothers and played “Gash” in the cult Scottish comedy Rab C.
During a prolific period, he took parts in the thriller The Contractor with Wesley Snipes and joined the cast of Rab C. Nesbitt[3] returning to the streets of his youth.
In 2012, Robertson starred with Simon Callow and Harry Enfield in the feature-length film Acts of Godfrey, a British comedy written entirely in verse.
[6][7] Robertson also starred in a one-man show Angels by Ronan O'Donnell at the "Play, a Pie and a Pint" event in Glasgow.