Line of Duty's Kelly Macdonald has revealed that only the programme's 'top cast' know who 'H' really is.The popular BBC drama is set to air its finale episode on Sunday and fans are desperate to find out who the mysterious "fourth man" is.Numerous characters are being speculated as viewers continue to try and work out who the individual commanding the network of corrupt officers is.Kelly, who plays Jo Davidson on the iconic programme, has said show creator Jed Mercurio is "troublesome" as she explained only the "top cast" know who 'H' is.The 45-year-old Trainspotting star told PA news agency: "The main cast know.
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