In Hijack episode 4, there's this scene where the hijacker yells at one of the air attendants to go on the intercom to warn all the passengers to behave.
But then he tells the attendant to use "...that f***-ing stupid sing song accent you all do..." That air attendant clearly has an RP accent, or close enough to my ears. Have I misunderstood the accent? Or is there something else going on with the plot?