The dark comedy, written by and starring Reece Shearsmith and Steve Pemberton, averaged 1.4m (7.8%) for BBC Two from 10pm, while 45k (0.2%) tuned in on BBC HD.
Earlier, Tina O'Brien's exit from Strictly Come Dancing was watched by 9.75m (37.4%) on BBC One from 7.30pm and 370k (1.4%) in HD. The programme was followed on BBC One by Antiques Roadshow, which pulled in 5.71m (19.9%) and 179k (0.6%) on BBC HD.
On ITV1, the latest live results show of The X Factor appealed to 13.02m (45.4%) in the 8pm hour, while 830k (2.9%) watched on ITV1 HD.
Single Father secured 4.14m (15.3%) on BBC One in the 9pm hour and 124k (0.5%) in HD, but it was soundly beaten by Downton Abbey, which mustered 8.59m (31.7%) on ITV1 and 431k (1.6%) on ITV1 HD.
Earlier on ITV1, The Cube appealed to 5.12m (20.6%) from 7pm and 219k (0.9%) in HD, but it was outperformed by Countryfile's Autumn Special, which brought in a healthy 7.89m (31.1%) on BBC One from 6.30pm and 162k (0.7%) on BBC HD.
A repeat of Top Gear entertained 1.54m (6.1%) on BBC Two in the 7pm hour, before Return of the Rhino: A Last Chance to See Special had 1.53m (5.3%). New series James May's Man Lab then premiered to 1.97m (7.3%) from 9pm.
Due to Psychoville, Match Of The Day 2 switched to BBC One, where the football highlights programme grabbed 2.74m (20.1%).
Over at Channel 4, The Genius of British Art educated 430k (1.7%) in the 7pm hour and 69k (0.2%) on timeshift. The programme was followed by Undercover Boss USA, which had 630k (2.2%) and 162k (0.6%) on Channel 4 +1.
A new series of Secret Millionaire took 1.75m (6.5%) from 9pm and 331k (1.8%) an hour later, before Desperate Housewives entertained 1.26m (6.7%) and 134k (1.4%) on timeshift.
On Channel Five, screenings of Little Man and Dumb And Dumber attracted respective audiences of 763k (2.8%) and 983k (4.5%) from 7.15pm.
Overall, ITV1 owned primetime with 29.7% (HD: 1.6%) against BBC One's 23%. BBC Two came in third with 6.6%, followed by Channel 4 with 4% (+1: 0.7%) and Channel 5 with 3.6%.
Elsewhere, The Xtra Factor appealed to 1.17m (4.3%) on ITV2 from 9pm and 161k (0.9%) an hour later.
The programme was followed on ITV2 by new reality series The Only Way Is Essex, which had 671k (3.2%) and 85k (0.7%) on timeshift.
Detective series Thorne: Scaredy Cat pulled in 399k (1.5%) on Sky1 in the 9pm hour.
BARB ratings data supplied by Attentional