Watch He Who Dares: Downing Street Siege Full Movie Free Online 123Movies. The sequel to Paul Tanter's "He Who Dares" will continue to follow the Special Air Service (SAS) anti–hijacking counter–terrorism team. In the thriller, Christopher Lowe finds himself summoned to 10 Downing Street to be dishonorably discharged from the SAS for disobeying a direct order, despite the fact that he saved the Prime Minister’s only daughter.