The 10pm comedy, penned by Whitehall and also starring Mathew Horne, averaged an impressive 830k (4.3%) at 10pm yesterday (August 14) and 310k (7.5%) at 12.30am.
Whitehall's programme - dubbed the new Gavin & Stacey - has overtaken sketch show Horne and Corden's 817k (5.7%) from 2009.
Only a late-night edition of Family Guy (899k/9.2%) could trump Bad Education to top the multichannel ratings.
The corporation also fared well terrestrially, as the second series of Jimmy McGovern's Accused made a fine entrance with its best ever audience of 5.31m (23.4%) for BBC One in the 9pm hour for a story involving Sean Bean in drag.
Over on BBC Two, hit cooking show The Great British Bake-Off returned with a solid 3.46m (16.7%) at 8pm, boosting 9pm's Midwives: Delivering Under Pressure to 1.99m (8.8%).
The Rob Brydon Show kicked off its third run with 1.36m (7%) at 10pm, slightly down on the launch of its previous Friday night series last July.
Elsewhere, an uninspired lineup from ITV consisted of Countryfile, which grabbed 2.53m (13.5%) at 7.30pm (+1: 109k/0.5%), and another Lewis repeat - the Inspector Morse spinoff logged 2.7m (12.4%) and 265k (1.8%) on ITV1 +1.
A Seven Dwarves wedding topped Channel 4's night with 1.4m (6.1%) at 9pm and 350k (2%) on timeshift, while a Thelma's Gypsy Girls catchup drew a decent 1.22m (7.7%) at 10pm (+1: 154k/0.9%) - after Sunday's first showing aired opposite the Olympics Closing Ceremony.
Overall, BBC One led primetime with 24%, thrashing ITV1's 13.5% (+1: 1%). BBC Two claimed third place with 9.5%, comfortably ahead of Channel 4's 5.1% (+1: 1%), and Channel 5's 4.9% (+1: 0.2%).
BARB ratings data supplied by Attentional