The first instalment of the comedy drama, which stars Michelle Ryan, Sean Maguire and Adam Garcia, put in 3.45m (15.7%) during the 9pm hour.
Earlier on ITV1, the half-hour Christmas For A Pound: Tonight had 4.49m (21.1%) at 8pm.
Over on BBC One, A Question Of Sport and Have I Got News For You put in 3.37m (15.2%) and 5.03m (22.7%) at 8.30pm and 9pm respectively, then 4.35m (20.2%) watched Live At The Apollo at 9.30pm.
We Are Family logged 940k (4.3%) during the 8pm hour, then the audience climbed to 3m (13.7%) during the 9pm screening of Victorian Farm Christmas.
Channel 4's double bill of Jamie At Home repeats attracted 1.02m (4.8%) and 1.47m (6.6%) at 8pm, then 870k (3.9%) tuned in for David Blaine: Magic Man at 9pm.
Five's Axe Men was seen by 655k (3%) at 8pm, then an NCIS repeat pulled in 1.34m (6.1%) during the 9pm hour.
Overall, ITV1 edged primetime with an average share of 23.4% to BBC One's 23.1%. BBC two was third with 7.4%, followed by Channel 4 with 3.9% (+1: 0.6%), and Five's 4.2%.
BARB ratings data supplied by Attentional