The comedy - now airing in an hour-long format - easily won the 8pm hour for BBC One. A Top Gear repeat had 3.81m (18.1%) for BBC Two, and on Channel 4, Wife Swap picked up 1.85m (8.8%). Five documentary Grizzly Bear Face-Off managed 787k (3.7%).
A rerun of Poirot put in 2.98m (15.3%) between 7pm and 9pm, then the second episode of crime drama Single-Handed claimed 3.45m (17.1%) over the following two hours.
At 9pm, Rivers with Griff Rhys Jones took 4.92m (21.7%) for BBC One, while Channel 4's Big Brother interested 1.88m (8.3%). BBC Two's Louis Theroux - The City Addicted To Crystal Meth, about the rife addiction to crystal-meth in California's Central Valley, pulled in 2.66m (11.7%). Five movie Flight Of Fury averaged 1.44m (7.1%) between 9pm and 11.05pm.
BBC One led primetime overall with an average share of 20.4% to ITV1's 16.1%. BBC Two was third with 11.6%, followed by Channel 4 with 7.6% (+1: 1.1%) and Five with 5.3%.
Sky1's 9pm screening of House was the most-watched multichannel programme of the day, averaging 694k (3.3%) for the hour. A second episode followed at 10pm with 636k (3.9%).
BBC Three's screening of comedy movie The Princess Diaries averaged 688k (3.8%) between 7.10pm and 9pm, then teen documentary Young, Dumb and Living Off Mum put in 428k (2.1%).
BARB ratings data supplied by Attentional