In the first episode: across six days in 1980 the eyes of the world fixed upon London's Iranian Embassy, where terrorists held over 20 hostages. Next door a squadron of SAS soldiers sit quietly, primed and ready to raid and rescue those held.

A look at the mission of a select group of British Special Forces who were sent to Africa's smallest country, Gambia, in the midst of a coup to covertly rescue the absent president's wife and children