Rent Bellman and True (1987)

In this tense British thriller, Hiller (Bernard Hill), a humble computer expert, and his young stepson get mixed up with a dangerous gang of bank robbers. Recently fired from his job and abandoned by his wife, Hiller's life is already descending into chaos when he crosses paths with the brutal gang of criminals. Planning an audacious robbery, they take Hiller and his child hostage, and force Hiller to use his technical skills to help them on the job. Once the plan has been put into action, the gang attempts to shake off the police, while Hiller desperately tries to free himself and his son from the crooks' clutches.