The Carol Vorderman-hosted series slipped to 2.11 million (9.3%) at 8pm yesterday (March 13).
ITV's drama Lightfields also struggled with only 2.83m (12.5%) for the latest episode of the supernatural series.
BBC One's MasterChef pulled in a respectable 4.41m (19.5%) in its early slot of 8.30pm. The latest edition of The One Show attracted 3.96m (17.4%).
On BBC Two, two editions of Great British Menu cooked up 1.54m (6.7%) and 1.79m (7.8%) between 7.30pm and 8.30pm. At 9pm A Very British Wedding collected 1.11m (4.9%), while Qi tickled 1.06m (4.8%) at 9.30pm.
Channel 4's Obsessive Compulsive Cleaners was watched by 1.56m (6.9%) at 8pm, while One Born Every Minute pulled in 2.07m (9.1%) at 9pm. New sitcom The Mimic had 1.19m (6.65%) at 10pm.
NCIS had an audience of 1.48m (6.5%) on Channel 5 at 9pm. Law and Order: