The eviction show, which aired between 6.15pm and 7pm, was up around 200k week-on-week.
Immediately afterwards, Countryfile brought in 6.74m (31%) to rank as the most-watched programme of the day on any channel. Antiques Roadshow drew 5.23m (20.3%) in the 8pm hour, then the concluding half of '80s drama A Passionate Woman managed 5.07m (20.4%), a rise of 360k on last week's opener.
On ITV1, Foyle's War averaged 6.17m (23.8%) between 8pm and 10pm, rising over 200k week-on-week.
Come Dine With Me put in a strong 2.74m (10.6%) for Channel 4 in the 8pm hour, with a further 332k (1.3%) watching on timeshift. The Restoration Man followed with 1.65m (6.4%) and 310k (1.6%).
BBC Two's Tropic Of Cancer interested 1.52m (5.9%) from 8pm, then the latest Louis Theroux documentary, America's Medicated, appealed to 2.1m (8.1%).
Five's screenings of The Legend Of Zorro and Tomb Raider: The Cradle Of Life put in 1.07m (4.7%) and 1.37m (6.2%) from 6.30pm.
Overall, BBC One averaged 22.9% in primetime, while ITV1 had 17.7%. Channel 4 was third with 7.5% (+1: 1%), followed by BBC Two with 7.3% and Five with 5.4%.
A repeat of Saturday night's Britain's Got Talent was the most-watched multichannel programme of the day, drawing 954k (4.6%) to ITV2 from 6.20pm. A further 22k (0.9%) watched an hour later on ITV2+1.
The ensuing repeat of Britain's Got More Talent notched up 757k (2.9%) and 284k (1.1%).
New episodes of 24 and House brought in 579k (2.2%) and 370k (1.9%) to Sky1 from 9pm.
BARB ratings data supplied by Attentional