The Reckoning, starring Ashley Jenson as a woman bequeathed £5m on the proviso that she "kill a man who deserves to die", averaged 5.31m (22.2%) for ITV1 in the 9pm hour and 135k (0.8%) on +1.
The programme beat Channel 4's royal wedding documentary Meet The Middletons, which had 1.98m (8.3%) and 326k (1.8%) on timeshift. It was also too strong for Motorway Cops' 3.95m (16.5%) on BBC One.
Earlier, Bang Goes The Theory educated 2.91m (13.5%) on BBC One from 7.30pm, while The Dales entertained 3.62m (16.2%) on ITV1 from 8pm. Panorama: The Trillion Dollar Conman mustered 2.84m (12%) on BBC One from 8.30pm.
Over at BBC Two, Live Snooker: The World Championship fetched 1.01m (4.9%) in the 7pm hour. Railway Walks and Raymond Blanc's Kitchen Secrets appealed to 1.36m (5.7%) and 1.48m (6.2%) respectively in the 8pm hour. Fix My Family captivated 960k (4%) from 9pm and Never Mind The Buzzcocks amused 1.17m (5.9%) from 10pm.
Sarah Beeny's new series Help! My House Is Infested debuted with 1m (4.2%) on Channel 4 from 8pm and 248k (1%) on +1. A screening of Hostage pulled in 1m (7.6%) from 10pm and 112k (1.6%) on timeshift.
Channel 5's How Do They Do It? grabbed 626k (2.9%) from 7.30pm, before The Gadget Show switched on 1.03m (4.3%) in the 8pm hour. The return of The Hotel Inspector booked in 1.58m (6.6%) in the 9pm hour, before Extraordinary People: The Rainman Twins amazed 1.02m (5.8%) from 10pm.
Overall, ITV1 won primetime with 25.4% (+1: 0.5%) against BBC One's 20.2%. Channel 4 came in third with 5.4% (+1: 0.9%), followed by BBC Two with 5% and Channel 5 with 4.7%.
Elsewhere, Glee averaged 1.3m (5.5%) for E4 from 9pm and 350k (2%) on +1.
Game Of Thrones, an adaptation of George R.R. Martin's fantasy series starring Sean Bean, premiered with a healthy 743k (3.2%) on Sky Atlantic from 9pm.
BARB ratings data supplied by Attentional