Despite declining slightly for a third week, the series is by far the channel's best-rated new programme, performing miles above Watch's usual slot average with 961k (4.5%) at 9pm.
However, it lost its place atop the multichannel league table, as a classic edition of Lewis snatched first position with 1.16m (5.8%) for ITV3 at the same time.
Crimewatch topped the hour for BBC One with 3.79m (17.8%), ahead of ITV1's Superstar which rebounded to 2.9m (13.9%). The Truth About Sports Products interested 3.1m (14.6%) for BBC One at 8pm versus ITV's soap hour.
Mock the Week was BBC Two's best-rated show with 1.68m (8.5%) at 10pm, prior to which 1.55m (7.3%) watched Pompeii: Life and Death in a Roman Town.
Country House Rescue logged 1.34m (6.3%) for Channel 4 at 8pm (+1: 137k/0.6%), then Bank of Dave soared to 1.13m (5.6%) and 170k (1%) on timeshift from under a million for its opener last week.
The Hotel Inspector anchored Channel 5's schedule with 1.46m (6.9%) at 9pm (+1: 182k/1%), after which 1.12m (6.1%) caught Big Brother.
Overall, ITV won primetime with 21% (+1: 0.6%) against BBC One's 19.1%. BBC Two claimed third place with 6.4%, ahead of Channel 4's 4.7% (+1: 0.7%), and Channel 5's 4.3% (+1: 0.3%).
BARB ratings data supplied by Attentional