The crime drama took 6.34m (26.9%) from 9pm, with a further 288k (1.7%) on timeshift.
The Dales aired earlier to 4.08m (16.4%) and 140k (0.6%) on +1.
Elsewhere, BBC One's Panorama attracted 2.5m (10.1%) from 8.30pm, with Empire managing 2.97m (12.6%).
BBC Two aired University Challenge (3.03m/12.1%), The Little Paris Kitchen: Cooking with Rachel Khoo (1.69m/6.8%) and The Tube (1.9m/8%).
On Channel 4, China: Triumph and Turmoil was watched by 908k (3.6%) and Embarrassing Bodies had 2.54m (10.8%) with 479k (2.9%) on timeshift.
Channel 5 showed Executive Decision, which averaged 795k from 9pm.
Overall, ITV1 comfortably won primetime with 27.4% (+1: 0.8%) ahead of BBC One's 18.2%. BBC Two came third with 7.1%, beating Channel 4's 6.5% (+1: 1.1%) and Channel 5's 3.3%.
On the multinationals, Skins grabbed 358k (2.1%) on E4 with an additional 142k (1.7%) on +1 and BBC Four's Only Connect Sport Relief Special entertained 669k (2.7%).
BARB ratings data supplied by Attentional