Kelly Macdonald has revealed that she had to stop 'binge-watching' past series of Line Of Duty ahead of joining the cast. The actress, 45, who plays Jo Davidson in the sixth season, explained that seeing how gripping the old episodes were was 'intimidating' and she started to think she wouldn't 'turn up' for filming in Belfast if she carried on watching. Speaking on Lauren Laverne's show on BBC Radio 6 Music on Friday, Kelly also admitted that she won't be tuning into Sunday's hotly-anticipated finale. 'It was too intimidating': Kelly Macdonald has revealed that she had to stop 'binge-watching' past series of Line Of Duty ahead of joining the cast