David Tennant and Emily Watson's new drama opened with 2.49 million viewers (11.2%) at 9pm.
Earlier, James May's Man Lab ended with 1.19m (5.5%) at 8pm, while new comedy series Watson & Oliver was seen by 903,000 (2.9%) at 10pm.
BBC One's MasterChef climbed as the semi-finals continued to 5.21m (24.0%) at 8pm. Great Bear Stakeout took in 3.37m (15.1%) at 9pm, while Question Time attracted 2.62m (22.2%) at 10.45pm.
ITV's coverage of Chelsea's Europa League win over Basle scored 3.76m (17.4%) at 7.45pm.
On Channel 4, Secret Eaters grabbed 1.32m (6.1%) at 8pm, with 255k (1.1%) tuning in on +1. Sex Clinic secured 924k (5.7%) at 10pm.
Channel 5's Cowboy Builders was seen by 1.15m (5.3%) at 8pm, followed by Trauma Doctors with 1.19m (5.0%) at 9pm.
Russell Howard's Good News returned to BBC Three with 780k (4.3%) at 10pm. Conjoined-twins documentary Joined for Life was viewed by 497k (2.2%) at 9pm.
On E4, The Big Bang Theory amused 1.94m (5.6%) at 8pm (485k/2.2% on +1), while How I Met Your Mother attracted 632k (2.8%) at 8.30pm (327k/1.5%).
ITV2's Peter Andre: My Life dipped to 757k (3.4%) at 9pm, while Celebrity Juice tickled 1.28m (7.5%) at 10pm.
BARB ratings data supplied by Attentional