The live programme averaged 1.84m (10.7%) for Channel 4 from 10pm, down 170k on Monday night's debut broadcast. However, the show was able to pull in a further 213k (2.4%) on timeshift.
Also on Channel 4, the return of Gok's Fashion Fix averaged 1.79m (9.2%) in the 8pm hour and 251k (1.1%) on timeshift, and documentary The Twins Who Share A Brain gained 2.09m (9.5%) from 9pm and 259k (1.5%) on timeshift.
Detective series Luther saw another drop in its audience to 3.98m (18%) on BBC One from 9pm.
However, the programme still comfortably won the 9pm hour after The Bill attracted just 2.99m (14.5%) for ITV1.
BBC One also gained victory in the 8pm hour, with Holby City pulling in 5.19m (24.1%) compared to Who Wants To Be A Millionaire? with 3.11m (14.5%) on ITV1.
The RHS Flower Show gained 2.49m (11.6%) for BBC Two in the 8pm hour. It was followed by The Story Of Science, which gained 1.63m (7.3%).
Cowboy Builders saw a 320k week-on-week drop to 1.05m (6.5%) for Five in the 8pm hour.
Later on the channel, CSI: Crime Scene Investigators appealed to 1.8m (8.9%) from 9.15pm to 10pm, down 220k week-on-week.
Overall, BBC One gained victory in primetime with 22.3% compared to ITV1's 17.3%. Channel 4 took third place with 8.4% (+1 0.9%), ahead of BBC Two with 7% and Five with 5.3%.
Elsewhere, The Vampire Diaries appealed to 607k (2.7%) for ITV2 in the 9pm hour and 73k (0.4%) on timeshift.
BARB ratings data supplied by Attentional