The latest instalment of the Tamzin Outhwaite-fronted series, managed 2.94m (11.5%) during the 9pm hour compared to last week's 4.13m (16.3%).
It was beaten in the hour by BBC Two's Delia's Classic Christmas, which had 3.04m (11.9%) and I'm A Celebrity..., which put in a respectable 7.89m (31.2%) for ITV1 between 8.30pm and 10pm.
Channel 4's The Queen managed 1.75m (6.8%) and 1.67m (6.5%) watched CSI: Miami on Five.
Holby City grabbed 4.45m (18.4%) at 8pm, losing viewers due to a clash with ITV1's Coronation Street.
Also at 8pm, 1.89m (7.8%) tuned in for A History Of Scotland on BBC Two, Channel 4's Country Home Rescue took 1.27m (5.2%) and Sea Patrol UK logged 1.09m (4.5%) for Five.
Overall, ITV1 came top during primetime with an average share of 26% to BBC One's 19%. BBC Two was third with 8.7%, followed by Channel 4 with 5.7% (+1: 0.5%) and Five's 4.8%.
Over on the multichannel stations, ITV2's I'm A Celebrity... spinoff managed 600k (3.6%) during the 10pm hour.
BARB ratings data supplied by Attentional