Line of Duty is set to air its finale episode on Sunday and fans are desperate to find out who the mysterious "H" is.Stars of the popular medical drama, Vicky McClure and Martin Compston, are set to appear on The Jonathan Ross Show this weekend and the pair laugh off a few fan theories during the show.Presenter Jonathan will put some fan theories to them to see their reaction.The host will ask the actors about a specific anagram code theory that fans are currently speculating.It's been discussed that character Jimmy Lakewell previously gave a hint by saying "look beyond the race claim to find H".Fans are convinced it's a major clue because, if you take the letters which make up "race claim" out of Carmichael, you are left with one letter –.
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