6 Days tells the story of a six-man terrorist team who captured the building in Knightsbridge, taking twenty-six hostages over a six-day ordeal.
The film documents the crisis from the perspective of Firmin (Bell), hostage negotiator Max Vernon (Strong) and journalist Kate Adie (Abbie Cornish).
The first look trailer shows Strong planning to “stop violence” before Bell and his team of SAS soldiers are given the command to storm the building.
Bell spoke previously about joining the film, and said he wanted to be involved because the event has “burnt itself onto the retina” of the British consciousness.
He had SAS training for the role in New Zealand which involved “using explosives” and “capturing hostages”.
Speaking to the Standard he said: “A lot of it was carrying your own kit, being in kit all day long, doing multi-room clearances, handling weapons, being in situations where you would be out of breath and they would make you do it again.
“We’d do 11-minute runs of multi-room clearances which would involve capturing hostages, bringing them out, using explosives, putting them in rooms, running into rooms that are literally exploding, people shooting blanks at you, us firing blanks at targets, very much the training that you go through once you have kind of already got into the SAS. Although the truth is we missed the selection process, which is the tricky part.”
6 Days is set for UK cinema release on August 4.