Philip Winchester, who plays Stonebridge, is an American actor playing a British character. Sullivan Stapleton, who plays Scott, is an Australian actor playing an American character.
All the English female actors along with their male counterparts had extensive training with British SAS and SBS instructors.
Before the second series, main cast members took up intensive bootcamp style training in South Africa by former SAS and SBS operators. Sullivan Stapleton and Philip Winchester underwent the most intensive training. The actors were trained in many aspects including running, teamwork, tactical manoeuvres with and without weapons and other various military tactics.
It was announced in October 2015 that plans to make a Strike Back feature film were in the early planning stages, with the two leads, Sullivan Stapleton and Philip Winchester, to reprise their roles.