Line Of Duty's Vicky McClure and Martin Compston share moving tributes ahead of ...

Line Of Duty creator Jed Mercurio excited fans when he shared the first clue about the plot of season six to Twitter.

Uploading a snap of a packet of the Australian chocolate biscuits TimTams with the caption '#LineofDuty Series 6 Plot Clue No. 1', fans began to ferociously speculate as to what it might mean.

But one plot point hanging over the next season of the show is about the identity of the ominous 'H'.

While the mystery was somewhat answered in the season five finale, it was also revealed that there are FOUR people pertaining to be 'H', with the final one still unknown.

So who could it be?

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Patricia Carmichael (Anna Maxwell Martin)

Patricia Carmichael (Anna Maxwell Martin)

Patricia Carmichael (Anna Maxwell Martin)

She was one of season five's stand-out characters, swooping in towards the end of the series to interrogate Ted Hastings - highly suspected to be 'H' at the time.

And while she simply seemed to be excellent at her job - and hellbent on uncovering the corruption within the department - could it be that Patricia Carmichael was SO keen to pin the blame on Ted to take the focus away from herself.

Could SHE be the fourth 'H'?

Her position of power and respect, along with her unnaturally steely and

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