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While another added: 'Okay who else is ready for this? #Line of Duty.'
Another Line of Duty fan wrote: 'Imagine being the actor who plays 'H' waking up tomorrow to your face on the front of every tabloid newspaper in the UK.'
Elsewhere actor Sanjeev Bhaskar wrote: 'So final episode of this series of Line of Duty in just over an hour so I'll say in advance...that's exactly what I thought was going to happen.'
Prior to tonight's show, fans shared their excitement and began to speculate who 'H' could be
Detective Steve Arnott finally speaks with a doctors from Occupational Health after putting off a drugs test