Can YOU tell who these Line of Duty stars grew up to be?

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Can YOU tell who these little stars grew up to be? As Britain awaits the identity of H in the hotly anticipated Line of Duty finale, FEMAIL looks at what the cast looked like before their fame

  • Millions of viewers are expected to tune in to the season six finale of BBC One’s Line of Duty on Sunday night 
  • Drama has made huge stars out of their cast, but what were they like before their fame in the TV series
  • As Britain eagerly awaits to discover the identity of ‘H’ in the Jed Mercurio show, FEMAIL looks back at the Line of Duty cast as kids, so can you tell the young Vicky McClure from baby-faced Anna Maxwell Martin?

By Bridie Pearson-jones For Mailonline

Published: | Updated:

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Millions of viewers are expected to tune in to the season six finale of Line of Duty on Sunday night after 11 million watched into the penultimate episode last week.

The police drama which has captured the imagination of Britons has made huge stars out of their cast, but what were they like before they spent their days catching bent coppers? 

You’d be forgiven for not recognising bearded Martin Compston, 36,  who plays Steve Arnott, from his 2002 debut as the lead in Ken Loach’s Sweet Sixteen.

Meanwhile, baby-faced Adrian Dunbar is a world away from his famous frown in pictures from her childhood.  

DSI Jo Davidson played by 45-year-old Kelly MacDonald has hardly changed from when she starred as teenager Diane Coulston in 1996’s Trainspotting, others including Vicky McClure  are more tricky to pick from a line up.   

So, as Britain eagerly awaits to discover the identity of  ‘H’ in the Jed Mercurio  show, FEMAIL looks back at the Line of Duty cast as kids…  

Grown up and gruff! Now with an impressive beard, Martin Compston, 36, who plays Steve Arnot is unrecognisable from his baby-faced debut

You’d be forgiven for not recognising bearded Martin Compston, 36, who plays Steve Arnot (right)  from his 2002 debut as the lead in Ken Loach’s Sweet Sixteen (left)

Adrian Dunbar is pictured as a child

Mother of God! Adrian Dunbar is pictured now as Ted Hastings

Mother of God! Series lead Ted Hastings (right) played by 62-year-old Adrian Dunbar hadn’t yet developed his famous frown in his childhood pictures (right)

Kelly MacDonald is pictured as Diane Coulston in 1996's Trainspotting

DSI Jo Davidson played by 45-year-old Kelly MacDonald (pictured now)

DSI Jo Davidson played by 45-year-old Kelly MacDonald (right, now) has hardly changed from when she starred as teenager Diane Coulston in 1996’s Trainspotting (left)

Vicky McClurea as  a child

Vicky McClure, 37, has been in all six series of Line of Duty as Kate Fleming (pictured)

Vicky McClure, 37, has been in all six series of Line of Duty as Kate Fleming (right) but photos show she was a big Disney fan as a child (left)

Gregory Piper is pictured as child

Gregory Piper,, now 23, played by is the youngest actor on the show and was just 13 when he made his debut as Ryan Pilkington. He is pictured left as a child and right now. Pictured now

Gregory Piper,, now 23,  played by is the youngest actor on the show and was just 13 when he made his debut as Ryan Pilkington. He is pictured left as a child and right now

Anna Maxwell Martin as a child

Anna Maxwell Martin as DCS Patricia Carmichael

Anna Maxwell Martin has won fans over for her role as DCS Patricia Carmichael (right now) but was even more adorable as a child (left)

Nigel Boyle as a child

Nigel Boyle as Ian Buckells

You can see a strong resemble in Nigel Boyle (left) as a child. Who plays Ian Buckells, a Detective Superintendent in Central Police assigned to the Hillside Lane Station Murder Investigation Team.