Will Mellor and Arsher Ali join Daniel Mays in the Line of Duty 3 cast

Line of Duty series three has begun filming with an all-new, including Mrs Biggs star Daniel Mays, Broadchurch's Will Mellor, Arsher Ali, who was seen most recently in Arthur & George, and Leanne Best (Ripper Street).

Jed Mercurio, writer and creator of Line of Duty, said: "Sgt Danny Waldron (Mays) appears to run a team of crack firearms officers, but hidden tensions simmer beneath the surface. We're all hugely excited that Will Mellor, Arsher Ali and Leanne Best have agreed to play these pivotal roles."

Will plays PC Rod Kennedy, Arsher plays PC Harinderpal ‘Hari’ Bains and Leanne plays WPC Jackie Brickford in the new six-part series of the hit BBC2 show about the murky world of police corruption.

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Patrick McLennan is a London-based journalist and documentary maker who has worked as a writer, sub-editor, digital editor and TV producer in the UK and New Zealand. His CV includes spells as a news producer at the BBC and TVNZ, as well as web editor for Time Inc UK. He has produced TV news and entertainment features on personalities as diverse as Nick Cave, Tom Hardy, Clive James, Jodie Marsh and Kevin Bacon and he co-produced and directed The Ponds, which has screened in UK cinemas, BBC Four and is currently available on Netflix.

An entertainment writer with a diverse taste in TV and film, he lists Seinfeld, The Sopranos, The Chase, The Thick of It and Detectorists among his favourite shows, but steers well clear of most sci-fi.