The premiere episode opened to 5.53 million viewers (23.0%) at 9pm, while a further 344,000 (1.8%) tuned in on +1. These were the highest figures of the night overall outside of soaps.
Russell Tovey and Sarah Hadland's new comedy The Job Lot followed with a decent 4.49m (19.0%) at 9.30pm (248k/1.7 on +1).
Earlier, James Nesbitt's Ireland attracted 2.94m (12.5%) at 8pm.
On BBC One, Bang Goes The Theory was seen by 2.81m (13.6%) at 7.30pm. Panorama brought in 2.17m (9.2%) at 8.30pm, while this month's Crimewatch acquired 3.41m (14.3%) at 9pm.
BBC Two's evening coverage of the World Snooker Championship continued with 1.17m (5.9%) at 7pm.
The University Challenge final quizzed 2.81m (12.1%) at 8pm, followed by Victoria Coren's Only Connect gameshow with 1.90m (8.0%) at 8.30pm. Dave Allen documentary God's Own Comedian was seen by 2.73m (11.%) at 9pm.
Channel 4's Dispatches grabbed 1.31m (5.6%) at 8pm, while Superscrimpers attracted 1.15m (4.9%) at 8.30pm.
The Hoarder Next Door continued with 1.48m (6.2%) at 9pm, with 342k (2.1%) tuning in on +1.
On Channel 5, Nature Shock entertained 614k (2.6%) at 8pm, while Ben Fogle's New Lives in the Wild was seen by 1.08m (4.6%) at 9pm.
E4's Made in Chelsea continued with 508k (3.2%) at 10pm. BBC Four's new series The Flying Archaeologist opened to 630k (2.7%) at 8.30pm.
On Sky1, Arrow's latest episode was seen by 481k (2.0%) at 8pm, while Sky Atlantic's Game of Thrones thrilled 538k (2.3%) at 9pm.
BARB ratings data supplied by Attentional