Who Do You Think You Are? returned on BBC One with nearly 5 million viewers on Wednesday, according to overnight figures.
Sherlock actress Una Stubbs's appearance on the ancestry documentary series interested 4.94m (23.1%) at 9pm.
Earlier, a repeat of The Sheriffs Are Coming was seen by 3.67m (20.8%) at 7pm, followed by Your Money, Their Tricks with 3.79m (19.7%) at 8pm.
On BBC Two, Restoration Home appealed to 1.42m (7.4%) at 8pm, while The Real White Queen continued with 1.34m (6.3%) at 9pm.
ITV's The Zoo attracted 3.55m (18.4%) at 8pm, with a further 225,000 (1.1%) tuning in on +1. Ray Mears's Close Encounters gathered 2.09m (9.8%) at 9pm (218k/1.3% on +1).
On Channel 4, Superscrimpers continued with 1.01m (5.3%) at 8pm (277k/1.3%), while 24 Hours in A&E gathered 1.84m (8.6%) at 9pm (396k/2.4%).
Channel 5's second instalment of Myra Hindley: The Untold Story attracted 922k (4.8%) at 8pm. The latest Big Brother entertained 1.35m (6.3%) at 9pm (236k/1.4%).
Aidan Gillen's new drama Love/Hate was seen by 691k (4.4%) at 10pm.
On BBC Three, Family Guy was the most-watched show on the multichannels with 922k (10.2%) at 11.30pm.
