71 Degrees North, featuring celebrities such as Martin Kemp, Amy Williams and Brook Kinsella taking on challenges in Arctic conditions, averaged 2.28m (9.6%) for ITV1 in the 9pm hour and 158k (0.9%) on +1.
The show just outperformed new series Hairy Bikers' Meals On Wheels, which had 2.24m (9.5%) on BBC Two, but was trounced by The Body Farm's 5.25m (22.2%) on BBC One.
Elsewhere, Mayday Mayday fetched 2.66m (12.4%) on ITV1 from 7.30pm. New show Missing Millions launched with 2.71m (11.9%) on ITV in the 8pm hour and 153k (0.6%) on +1, but lost out to Holby City's 4.9m (21.4%) on BBC One. The Bomb Squad grabbed 1.92m (16.2%) on BBC One from 10.45pm.
BBC Two's repeat of Dragons' Den took 1.34m (6.4%) in the 7pm hour, before The Great British Bakeoff served up 3.47m (15.2%) in the 8pm slot. Never Mind The Buzzcocks appealed to 1.18m (6.2%) from 10pm.
Inside Nature's Giants attracted 1.05m (4.6%) to Channel 4 from 8pm and 186k (0.8%) on +1. Observation documentary Seven Dwarves averaged 1.33m (5.6%) in the 9pm hour, and 294k (1.7%) an hour later, before new Shameless continued with 1.36m (8.1%) from 10pm and 202k (2.3%) on timeshift.
Chinese Food In Minutes served up 513k (2.4%) from 7.30pm. Mysteries of the Vampire Skeletons: Revealed spooked 1.12m (4.9%) in the 8pm slot, before CSI: Miami had 1.63m (6.9%) from 9pm. Big Brother attracted 1.37m (8%) in the 10pm hour.
Overall, BBC One won primetime with 23.6%, ahead of ITV1's modest 12.6% (+1: 0.5%). BBC Two came next with 9.5%, followed by Channel 4's 5.2% (+1: 0.9%) and Channel 5's 5.1%.
Elsewhere, Don't Tell The Bride engaged 896k (3.8%) on BBC Three from 9pm, and Elijah Wood's comedy Wilfred amused 468k (3%) from 10.30pm.
BARB ratings data supplied by Attentional