Line Of Duty's Vicky McClure, Adrian Dunbar and Martin CompstonIt looks like Line Of Duty fans may have cause for celebration following fresh rumours about the award-winning crime drama’s future.Three years have passed since viewers last checked in with the AC-12 unit, in the divisive season six finale.Ever since, speculation has been rife about whether Line Of Duty will ever come back for a seventh run, with rumours beginning once again last week when cast members Martin Compston, Vicky McClure and Adrian Dunbar revealed th