20% of the audience share tuned in to watch the conclusion of the PD James adaptation, which serves as a follow-up to Jane Austen's Pride and Prejudice, at 9pm.
Meanwhile, a new series of All Star Family Fortunes managed to top the night's ratings for ITV. 4.84m viewers (22.68%) saw the Dancing on Ice team take on the cast of Coronation Street in the series premiere at 7pm.
Back on BBC One, a showing of Disney Pixar's Up pulled in 3.55m (16.5%) at 6.50pm, while Atlantis dropped 1.9m viewers from last week, with the season finale attracting 3.67m (15.8%) at 8.15pm.
Over on BBC Two, Dad's Army was seen by 1.93m (8.84%) at 7.30pm, while a repeat of 2010 documentary 100 Years of the Palladium attracted 1.8m (7.84%) at 8pm.
Sci-fi drama I am Number Four, starring Alex Pettyfer and Dianna Agron, pulled in 1.46m (6.89%) at 9pm.
Back to ITV, a festive edition of Phillip Schofield's The Cube brought in 4.08m (17.84%) at 8pm, followed by The Jonathan Ross Show at 9pm, with 2.85m (13.08%) tuning in to see interviews with John Bishop, Jamie Oliver, Ray Winstone and David Attenborough.
Channel 4's broadcast of The Italian Job pulled in 1.12m (5.07%) at 7pm, while a countdown of The 50 Funniest Moments of 2013 amused 1.48m (7.17%) at 9pm.
Channel 5's biggest primetime ratings came from Taylor Lautner movie Abduction, which attracted 1.33m (6.51%) at 9pm. Earlier in the evening, the third heat of World's Strongest Man was watched by 915,000 (3.97%) at 8pm.
BBC Three topped the multichannel ratings, with a showing of Madagascar: Escape 2 Africa pulling in 922k (4.04%) at 8.15pm.
Ray Winstone's new two-part drama Moonfleet opened to 582k (2.53%) at 8pm on Sky1.
BARB ratings data supplied by Attentional