The reality show suffered a slight dip week-on-week, launching with 3.5m seven days ago, but the numbers were good enough to help the channel beat BBC Two in primetime.
Celebrity Big Brother's Bit on the Side followed with 927k (5.4%), while earlier in the night World's Scariest Plane Landings drew 1.66m (6.6%).
BBC One's New Tricks took 5.1m (21.7%) from 9pm, with Earthflight grabbing 4.13m (16.5%) earlier.
For ITV1, Tonight averaged 2.18m (10.6%) from 7.30pm, Eternal Law had 3.18m (13.5%) in the 9pm hour (+1: 169k/1%), and The Jonathan Ross Show entertained 944k (7.3%) from 10.35pm.
Channel 4 showed Location, Location, Location from 8pm, which appealed to 1.65m (6.6%) with a further 389k (1.7%) on +1. Restoration Man had 2.05m (8.7%) from 9pm (+1: 305k/1.7%), and My Daughter the Teenage Nudist was seen by 1.66m (9.5%) from 10pm (+1: 234k/2.3%).
BBC Two had a lineup of Hairy Bikers' Best of British (2.1m/9.2%), The Great Sport Relief Bake Off (2.31m/9.2%), Unfinished Masterpieces with Alastair Sooke (493k/2.1%) and Never Mind the Buzzcocks (1.08m/5.6%).
BBC One finished with 21.7%, ahead of ITV1's 20%. Meanwhile, Channel 4 had 6.8% (+1: 1%), edging Channel 5's 6.5% and BBC Two's 6.4%.
BARB ratings data supplied by Attentional