Dramaturgy

If you're allowed to include +1 ratings, ITV scored a higher average audience for its drama output in 2017 than BBC1.

Here's the figures for the past three years.

2015: BBC1  5.94m (170 hours), ITV (inc +1)  6.09m (117 hours)
2016: BBC1 5.68m (165 hours), ITV (inc +1) 5.42m (155 hours)
2017: BBC1 6.29m (158 hours), ITV (inc +1)  6.42m (140 hours)

Without +1, ITV's average for 2017 would be 5.97m.