My Big Fat Royal Gypsy Wedding averaged 3.95m (16.5%) for Channel 4 in the 9pm hour, peaking at 4.34m (17.8%) in the final 15 minutes. A further 650k (3.3%) watched the show on Channel 4+1.
The reality TV programme proved too strong for the new series of Only Fools And Horses spinoff Rock & Chips, which debuted with 3.37m (14.1%) on BBC One from 9pm.
However, both shows ultimately lost out to Long Lost Family, the Davina McCall and Nicky Campbell-hosted reunion show, which reunited 4.01m (16.7%) on ITV1 and 209k (1.1%) on +1.
William And Kate: In Their Own Words fetched 3.88m (19%) on ITV1 from 7.30pm and 129k (0.6%) on +1. Watchdog had 4.13m (18.7%) on BBC One in the 8pm hour and Kate And William: A Royal Love Story took 3.3m (20.9%) from 10.45pm.
B&B reality series Three In A Bed attracted 1.2m (5.4%) to Channel 4 in the 8pm hour and 274k (1.1%) on +1. 10 O'Clock Live entertained 650k (3.7%) and 126k (1.1%) on timeshift.
Over at BBC Two, Live Snooker - The World Championship pocketed 1.09m (5.2%) between 7pm and 9pm. Sir Bobby Charlton: Football Icon captivated 1.96m (8.2%) in the 9pm hour and Never Mind The Buzzcocks appealed to 1.08m (4.9%) from 10pm.
Channel 5's How Do They Do It? grabbed 521k (2.6%) from 7.30pm, before Live Uefa Europa League Football scored with 740k (3.2%) between 8pm and 10pm. A screening of In Hell scared up 781k (5.2%) from 10pm.
Overall, ITV1 won primetime with 22% (+1: 0.5%) against BBC One's 20.9%. Channel 4 came in third with 7.9% (+1: 1.3%), ahead of BBC Two with 5.8% and Channel 5 with 2.9%.
Elsewhere, Celebrity Juice amused 1.49m (7.1%) on ITV2 from 10pm, up a healthy 320k week-on-week. A further 318k (2.6%) watched the show on timeshift. Peter Andre: The Next Chapter had 655k (2.7%) on the channel in the 9pm hour and 162k (0.8%) on timeshift.
Don't Tell the Bride: All New Greatest Moments entertained 468k (2.1%) on BBC Three in the 8pm hour. Russell Howard's Good News took 912k (5.1%) on the channel from 10.30pm.
BARB ratings data supplied by Attentional