Episode #1.4 - S1-E4
Factual error: The soldier who shoots Yusra's father is listed on the credits as "Royal Scotch Guard." There is no such thing. There are two regiments: the Scots Guards and the Royal Scots. The soldier was actually a member of the latter, as correctly described in the dialogue.
Episode #1.2 - S1-E2
Factual error: The catalogue of errors made by the SAS team (e.g. being caught out in the open, not posting a watch, not using cover) would be unlikely to be made by an ordinary trained infantryman, let alone an elite special forces unit.