Line Of Duty’s Martin Compston teases an even bigger cliffhanger this week

‘You’ll need therapy at the end!’ Line Of Duty’s Martin Compston warns fans that Sunday’s cliffhanger is nothing compared to what awaits them at the climax of this week’s instalment

Martin Compston has warned Line Of Duty fans they will ‘need therapy’ by the end of Sunday night’s episode.

Last Sunday’s fourth episode of the current sixth series ended in a dramatic cliff-hanger as it was revealed DCI Jo Davidson (Kelly Macdonald) is related to a mystery person in the police database.

Martin – who portrays DI Steve Arnott – has teased viewers that is nothing compared to episode five’s finale.

The tension’s mounting: Martin Compston has warned Line Of Duty fans they will ‘need therapy’ by the end of Sunday night’s episode 

Martin took to Instagram to share a picture of Steve running in full police gear, and captioned it: ‘In all seriousness though if you thought Ep 4 ended on a cliffhanger, you’ll need therapy by the end of Ep5!’

He also joked that he was on his way to buy some more waistcoats – a wardrobe staple for the character – after non-essential shops reopened this week.

The actor, 36, added: ‘Episode 5 kicks off as stores re-open and there’s a sale on waistcoats!’

Last week’s drama-filled episode left viewers scrambling to guess who Jo Davidson’s DNA match was after traces were found at her former lover Farida Jatri’s home. 

Tease: Martin - who portrays DI Steve Arnott - has teased viewers that is nothing compared to episode five's finale

Tease: Martin – who portrays DI Steve Arnott – has teased viewers that is nothing compared to episode five’s finale 

Style: Martin's character DI Steve Arnott is famous for his smart waistcoats which he wears on every episode of Line of Duty

Style: Martin’s character DI Steve Arnott is famous for his smart waistcoats which he wears on every episode of Line of Duty

It comes after a major Line Of Duty spoiler was leaked on Tuesday night by one of the BBC‘s websites.

BBC Maestro inadvertently uploaded a post revealing a brand new character and a key plot twist, which is thought to transpire in the forthcoming next episode of the current sixth season.

The website – which is a hub for budding screenwriters – shared a photo of the new character on a database. 

AC-12’s Det Insp Steve Arnott, played by Martin, was seen scrutinizing the image.

Slip! It comes after a major Line Of Duty spoiler was leaked on Tuesday night by one of the BBC 's websites

Slip! It comes after a major Line Of Duty spoiler was leaked on Tuesday night by one of the BBC ‘s websites

A scene featuring the character was even shown, before it was removed.

The Sun contacted creator and writer of Line Of Duty Jed Mercurio, who told them: ‘The outstanding detective work of eagle-eyed Line Of Duty fans has been awarded a glowing commendation from the gaffer himself, Supt Ted Hastings. Their call-up papers for AC-12 are in the post!’

This jovial response to the incident suggests the leak was nothing too drastic. 

But a source also told The Sun: ‘This is an embarrassing and humiliating blunder. A lot of time and effort had gone into keeping the star’s role a secret.

Error: BBC Maestro inadvertently uploaded a post revealing a brand new character and a key plot twist, which is thought to transpire in the forthcoming next episode of the current sixth season

Error: BBC Maestro inadvertently uploaded a post revealing a brand new character and a key plot twist, which is thought to transpire in the forthcoming next episode of the current sixth season

‘Line of Duty goes to a lot of trouble making sure nothing gets out to ruin the surprise for viewers — but the BBC has shot itself in the foot on this and broken its own embargo.’

This follows the news that another star will return to the show this weekend, in the form of series five scene-stealer DCS Patricia Carmichael.

DCS Carmichael, played by BAFTA award winner Anna Maxwell Martin, will appear from Sunday’s episode of the police show.

Upload: The website - which is a hub for budding screenwriters - shared a photo of the new character on a database [not pictured]

Upload: The website – which is a hub for budding screenwriters – shared a photo of the new character on a database [not pictured]

Fans will remember the experienced anti-corruption officer from the previous series, when she was brought in as an independent investigator from AC-3 after suspicions mounted over the integrity of Superintendent Ted Hastings (Adrian Dunbar). 

Little is known about her return to the show, but it coincides with Superintendent Hastings’ forced retirement, suggesting she is looking to oversee the new restructure of the anti-corruption units.

Although she works in anti-corruption, there has also been speculation that DCS Carmichael could be the elusive fourth ‘H’. 

Who is it? The leak has sparked a sea of speculation about who could be playing the new character, after hinting that another top actor could be joining the series

Who is it? The leak has sparked a sea of speculation about who could be playing the new character, after hinting that another top actor could be joining the series