The 9pm drama earned 7.09m (29.2%), following Our Greatest Team: Athletes' Parade (3.08m/12.7%).
On ITV1, Paul O'Grady: For the Love of Dogs continued with 4.53m (18.3%) from 8pm with a further 246k (1%) on timeshift. Later on, Leaving earned 3.71m (14.4%) from 9pm (+1: 245k/1.4%).
BBC Two showed University Challenge (2.5m/10.6%), Lorraine's Fast, Fresh and Easy Food (1.61m/6.6%) and Horizon (841k/3.5%).
On Channel 4, 999: What's Your Emergency? was seen by 2.07m (8.5%) and 400k (2.3%) on +1. 9/11: The Miracle Survivor followed with 1.7m (10%) from 10pm (+1: 216k/2.3%). Earlier, Dispatches and Food Unwrapped managed 918k (3.9%) and 1.57m (6.5%) respectively.
Channel 5's Cowboy Builders was caught by 867k (3.6%) from 9pm (+1: 104k/0.6%). Frontline Police aired earlier to 949k (4%).
Overall, BBC One edged primetime with 22.7% ahead of ITV1's 22.2% (+1: 0.9%). Channel 4 came third with 6.5% (+1: 0.8%) beating BBC Two's 5.6% and Channel 5's 3.1% (+1: 0.2%).
On the multichannels, Revenge continued on E4 with 504k (2.1%) and 116k (0.7%) on timeshift.
BARB ratings data supplied by Attentional