Despite British gun laws. It is actually a common place for some soldiers who have returned from a war zone to illegally purchase a firearm. Especially those suffering from acute forms of PTSD. It is often times the only way they feel safe even out of a war zone.
The events in the series are set during October and November of 2018, as the legislation being pushed through parliament by the Home Secretary is entitled RIPA 2018, and multiple shots of documents, phone call records, computer screens, etc. clearly show the date
The BBC commissioned the series from the then independent World Productions in 2016. After ITV Studios Global Entertainment bought the company in 2017, they handle international distribution for the series.
The trivia items below may give away important plot points.
Skeptics who question the plausibility of an intimate relationship between a high-ranking political figure and her bodyguard can be assured that, according to former Home Secretary Jacqui Smith (2007-2009), it does happen. She personally knows of a case where a police officer was suspended for having an affair with a cabinet minister's wife.
Bodyguard features both Richard Madden, who played Robb Stark in Game of Thrones, and Tom Brooke, who played Lothar Frey in the same show. Brooke's character was one of the conspirators behind Madden's character's tragic demise at "the Red Wedding", as well as the actual murderer of Madden's character's wife.