The car featured in the chase scene is a 2008 Bentley Continental GT Speed. Bentley does not participate in product placement, so the film's producers purchased three of the cars for approximately $150,000 each. One car was mistakenly driven into a gorge; the second was used for the lion's share of the stunt shots. The filmmakers were astonished at how durable the car was despite the punishment it took; by the time filming concluded, the car only needed a cosmetic refit. Its frame and engine were all intact.
The APC vehicles were manufactured with real steel plating and armor plated glass windscreens so that actors and stunt people could interact with them authentically. They took four or five weeks to design and ten weeks to build. Two were manufactured, and every piece of them was custom made. There was talk of buying similar vehicles that were being decommissioned, but it turned out to be cheaper to build their own from scratch.
Despite having many dangerous choreographed stunts, only two went wrong. A motorcycle rider was dragged when he meant to roll safely aside. He was not injured. Another was the man whom Sol punches in the face on the train platform; on a second take of the scene, the stuntman's nose was broken.
Two DDS soldiers sent into Scotland are named "Miller" and "Carpenter". George Miller directed the "Mad Max" trilogy and John Carpenter directed New-York 1997 (1981) and Los Angeles 2013 (1996), all heavily influenced this film.
Though the film takes place in London and Scotland, most of principal photography was done in South Africa. The last scene shot in the country before moving to the UK, was the lengthy car chase with the Bentley crashing through the bus.