Line Of Duty fans left astonished to discover Martin Compston's Scottish accent

He has spent years perfecting his Southern accent while playing DI Steve Arnott on BBC police drama Line Of Duty.

So it was little wonder why some fans were stunned to discover that actor Martin Compston was in fact Scottish, when he appeared on The Jonathan Ross Show on Saturday night.

Tuning into the ITV show, viewers rushed to Twitter to share their shock at the 36-year-old actor's voice, with one confused fan tweeting: 'Excuse me, why is Steve Arnott Scottish?'.

Say what?! Line Of Duty fans were stunned to discover that actor Martin Compston was in fact Scottish, when he appeared on The Jonathan Ross Show on Saturday night

Say what?! Line Of Duty fans were stunned to discover that actor Martin Compston was in fact Scottish, when he appeared on The Jonathan Ross Show on Saturday night

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Martin, who hails from Greenock in Scotland had joined Line Of Duty co-star Vicky McClure (Kate Fleming) on the chat show where they opened up on the latest series of the Jed Mercurio penned drama.

But while it may be common knowledge to most that Martin is not a southerner like he portrays onscreen, there were many viewers who were not aware of this information and took to social media to voice their amazement.

'Wait what? Martin Compston is Scottish?' questioned one baffled fan.

Stunned: Tuning into the ITV show, viewers rushed to Twitter to share their shock at the 36-year-old actor's voice, with one confused fan tweeting: 'Excuse me, why is Steve Arnott Scottish?'

Stunned: Tuning into the ITV show, viewers rushed to Twitter to share their shock at the 36-year-old actor's voice, with one confused fan tweeting: 'Excuse me, why is Steve Arnott Scottish?'

While another declared: 'I will never get over Martin Compston's Scottish accent.'

A third asked: 'Urm excuse me, why is Steve arnott Scottish.'

With a fourth tweeting: 'Okay so why did I never know that the actor for Steve Arnott was actually Scottish, mind blown.'

Hard graft: Martin has spent years perfecting his Southern accent while playing DI Steve Arnott on BBC police drama Line Of Duty

Hard graft: Martin has spent years perfecting his Southern accent while playing DI Steve Arnott on BBC police drama Line Of Duty 

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One person hailed Martin's acting skills as the reason behind people's bewilderment, writing: 'OMG all the people realising that Martin Compston is Scottish thanks to Jonathan Ross just shows how good an actor he is ( Compston, not Ross).'

With an additional person borrowing a line from Superintendent Ted Hastings as they penned: 'Wait... Steve Arnott @martin_compston is actually Scottish?! Jesus, Mary, Joseph and the wee Donkey, who would've thought it.'

Meanwhile on the show, Scottish star Martin revealed the special technique he uses to help learn his lines and make sure his fake accent rings true. 

OMG: While it may be common knowledge to most that Martin is not a southerner like he portrays onscreen, there were many viewers who were not aware of this information and took to social media to voice their amazement

OMG: While it may be common knowledge to most that Martin is not a southerner like he portrays onscreen, there were many viewers who were not aware of this information and took to social media to voice their amazement

Martin, who typically speaks with his native accent, discussed working on his accent skills while playing DI Arnott on the popular BBC show.

When asked how he manages it, Martin says: 'It can be hard, that dialogue on its own would be hard anyway, throw the accent in there... 

'The scene we did the other night, 30-pager, trying to juggle the accent at the same time. When we're away from it for a long time, when I do that voice I can hear him, it's like a costume.'

Practice makes perfect: Scottish star Martin revealed the special technique he uses to help learn his lines and make sure his fake accent rings true

Practice makes perfect: Scottish star Martin revealed the special technique he uses to help learn his lines and make sure his fake accent rings true

Martin says someone records his lines for him to listen to: 'I walk about all day with him in my ears. It's just graft. I'm not naturally good at accents. I need to work harder, which then makes me better because I'm not complacent with it.' 

He adds: 'If you're in these scenes with these amazing actors, amazing guest stars, it's intimidating enough without worrying about the accent. Speaking to the wife and stuff I'll drop it, I very much stay in it [on set].'

Elsewhere during the interview, Martin discussed how he struggled to fit into his infamous waistcoats after putting on weight during

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