The Keith Lemon panel show's Olympics-themed eighth series opener appealed to 1.48m (7.9%), and 315k (3%) on ITV2 +1.
Despite topping the multichannel ratings by some distance, the show's audience was a tad lower than February's record-breaking winter launch.
Lemon La Vida Loca followed with 701k (5.7%) at 10.45pm (+1: 143k/2.3%), after which three more editions of the mockumentary aired back-to-back to lower audiences.
Over on BBC One, Liverpool police drama Good Cop premiered with 4.06m (17.8%), winning its slot over an old Doc Martin (2.42m/10.6%) on ITV1 (+1: 183k/1%) and The Hotel Inspector (1.7m/7.5%) on Channel 5 (+1: 132k/0.7%).
Athletics on BBC Two drew 1.35m (6.3%) for two hours from 7pm, then a Volcano Live special on Iceland interested 1.5m (6.6%).
Documentary Revealed grabbed 1.09m (4.7%) for Channel 5, while Celebrity Big Brother took 1.87m (10.6%) in the 10pm hour.
Overall, BBC One topped primetime with 18.6%, beating ITV1 which averaged 16.6% (+1: 0.7%). Channel 4 won the battle for third place with 9.9% (+1: 0.5%), above BBC Two's 5.4%, and Channel 5's 6.1% (+1: 0.3%).
BARB ratings data supplied by Attentional