Mother of God: Line of Duty stars reveal ‘H’ storyline about to end

In an interview with Jonathan Ross to be broadcast tonight, Martin Compston reveals the mystery of ‘H’ will be solved in the final episode of series six.

Martin, who plays Steve Arnott in the hit show written by Jed Mercurio, told the chat show host that the storyline relating to four key people within the police operating under the codename H is set to conclude.

The BBC has not disclosed whether this series will be the last, though Martin said the final episode of series six will end “this natural story arc that we’ve been on for the last six years.”

The show, which is filmed in Northern Ireland, has made TV icons of Martin alongside Vicky McClure who plays Kate Fleming and Ulster’s own Adrian Dunbar as Superintendent Ted Hastings leading an anti-corruption unit within the police.

The current series of the crime drama, which features Kelly Macdonald as Acting Detective Superintendent Joanne Davidson, will come to an end on Sunday night.

With a bank holiday ahead some will be taking part in drinking games revolving around Ted’s use of Ulster colloquialisms.

Even Alexa has got in on the act, if you ask her who H is, she’ll remark, “Jesus, Mary and Joseph and the wee donkey, you want me to tell you who the fourth man is? No comment.”

The cast have been interviewed extensively on radio and TV this week but none of them have cracked under interrogation, keeping the show’s ending a tantalising secret.

The penultimate episode, aired last Sunday night, earned an average of 11 million viewers and 51.7% of the audience share, according to the broadcaster.

And in recent weeks episodes from previous series have become the most viewed on iPlayer as viewers seek to catch up before things come to a head tomorrow night.

On the Jonathan Ross show Martin has said he does not know if Line Of Duty will return after the current series, but that it will not return “just for the sake of it”.

He said: “We’ll come back if there’s a story to tell. But, so as well, if it ends well maybe sometimes it is best to leave it. But, so, genuinely we don’t know.”