Bums, Boobs and Botox, a series going behind the scenes of the UK's biggest provider of cosmetic surgery, averaged 1.31m (7.2%) for Channel 4 in the 10pm hour and 242k (2.3%) on +1.
Also premiering on Thursday night was new factual series Andrew Marr's Megacities, which built a solid 2.31m (10.5%) on BBC One in the 8pm hour. Traffic Cops had 3.08m (13.1%) from 9pm, and Question Time quizzed 2.5m (18.4%) from 10.45pm.
However, primetime was totally dominated by Britain's Got Talent, after the show's fourth semi-final entertained 9.29m (43.2%) on ITV1 between 7.30pm and 9pm. A further 300k (1.3%) watched the programme on ITV1+1.
Britain's Got Talent Results pulled in 9.29m (39.1%) from 9.30pm and 416k (2.5%) on timeshift, as singer Jai McDowall and comedic dancer Steven Hall moved into Saturday's final. Spinoff show Britain's Got More Talent mustered 754k (4.1%) on ITV2 from 10pm and 106k (1.1%) on +1.
Over at BBC Two, The Culture Show enchanted 640k (3.4%) in the 7pm hour, before Springwatch fetched 1.96m (8.9%) from 8pm and 103k (0.5%) on the BBC HD channel. Noir thriller The Shadow Line appealed to 1.54m (6.5%) in the 9pm hour, and spooky comedy Psychoville thrilled 800k (3.9%) from 10pm.
B&B reality series Three in a Bed booked in 970k (4.4%) on Channel 4 in the 8pm hour and 215k (0.9%) on +1. Documentary Meet the Elephant Man captivated 1.3m (5.5%) in the 9pm hour and 199k (1.1%) on timeshift.
Channel 5's Zoo Days grabbed 398k (1.9%) from 7.30pm, before Emergency Bikers pulled in 769k (3.5%) in the 8pm hour. Extreme Fishing with Robson Green caught 861k (3.7%) from 9pm, and a screening of Resident Evil: Apocalypse took 734k (4.7%) from 10pm.
Overall, ITV1 owned primetime with 35.5% (+1: 1.2%) against BBC One's 16.4%. BBC Two ranked in third with 5.7%, ahead of Channel 4's 5.2% (+1: 0.7%) and Channel 5's 3.1%.
Elsewhere, series seven of Johnny Vegas's sitcom Ideal continued with 512k (3.1%) on BBC Three from 10.30pm.
BARB ratings data supplied by Attentional