Line of Duty's Vicky McClure and Martin Compston, aka Kate Fleming and Steve Arnott, discuss fan theories on The Jonathan Ross Show, which airs on Saturday, May 1 ahead of the finale on Sunday - with Compston admitting that some fan theories are close to the truth.
Speaking ahead of the much-anticipated finale, the pair admit that they wind people up about the wild and varied theories about who is H and what will happen at the end of the current run.
On fan theories about the show, Vicky said: "We kind of wind people up a little bit, we know what’s coming. It’s more your family and close friends who are like, ‘So are you going to tell me?’ Even my mum – I was in their garden, dad went inside – my mum was like, ‘Come on.’ I said, ‘No, no!’ I don’t want to ruin it for them. I’d tell her, she wouldn’t tell anyone, but it’s ruining it for her then.”
Martin said that some fans are close with their guesses.
He said: "Every year you worry, are we still relevant? Are people still going to be invested? Now we’re bigger than ever, getting new fans... it’s an intense period when it’s on. Yeah man, the reactions have just been great. All these wild theories… some are pretty close!
"[During one episode] my dad went into a spiel of who it was [the relative of Jo Davidson], while he was saying it, I said who it was on the TV and he missed it. You have to pay attention.” Martin promises: “There’s a few big answers coming."

Jonathan puts some fan theories to them to see their reaction before asking the pair if there's going to be a seventh series.
On Patricia Carmichael, played by Anna Maxwell, tapping her pen four times (morse code for H) Vicky said: "Hmm that’s very interesting, yeah. Very, very interesting…"
It’s also put to them that the character Jimmy Lakewell gave a hint by saying ‘look beyond the race claim to find H’. It’s thought to be a clue because if you take the letters 'race claim' out of Carmichael, you are left with one letter, H.
“Do you know what I love about that one? It’s so spot on, but that line never got said," said Martin.
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Put to them that outgoing AC-12 boss Ted Hastings is a ghost only Kate and Steve can see, Martin added: “I think opposed to sixth sense, that one’s no sense.”
And of whether Ted could be Steve’s father he laughed: “It’s not Star Wars!”
Asked if there’ll be more series, Vicky said: “Genuinely don’t [know]. We don’t know anything, not just saying it for effect.”
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Martin added: “That’s nothing different for us. Jed always takes months after… there’s stuff above our pay grade, analytics, figures and all that kind of thing that comes in. He always takes time off."
While he thinks they've been on a natural story arc for the last six years, he added: “We won’t come back just for the sake of it. That’s for sure. 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.”
The Jonathan Ross Show is on ITV on Saturday, May 1 at 9.35pm