Line of Duty - watch online: streaming, buy or rent
Currently you are able to watch "Line of Duty" streaming on Hulu, Britbox Apple TV Channel , Acorn TV, BritBox, AcornTV Amazon Channel, BritBox Amazon Channel, Spectrum On Demand, Acorn TV Apple TV, Amazon Prime Video, fuboTV, Peacock Premium, Amazon Prime Video with Ads, Peacock Premium Plus or for free with ads on The Roku Channel, Pluto TV, Amazon Prime Video Free with Ads. It is also possible to rent "Line of Duty" on Amazon Video online and to download it on Amazon Video, Apple TV, Fandango At Home.
Besides streaming, you can also buy the series on DVD from Amazon DVD / Blu-ray and on Blu-ray from Amazon DVD / Blu-ray, Zavvi.
You can also stream the title for free on Hoopla, The CW, Plex, Plex Player, Plex Channel, Fawesome.