Despite the Channel 5 reality show recovering strongly from its all-time low the day before, last night's 1.48m (6.6%) is the lowest-rating final in its 12-year history, down 600k on last November's climax.
Back in June, Big Brother 13 had launched fairly brightly with 2.6m. Celebrity Big Brother launches on Wednesday night.
Airing straight after the main show at 10.30pm, Big Brother's Bit on the Side nabbed 813k (6%), while Frontline Police opened with a decent 1.02m (4.4%) in the 8pm hour.
Ruth Rendell's Thirteen Steps Down, a new ITV drama adaptation, premiered with 4m (17.2%) at 9pm - adding 287k (1.6%) on ITV1 +1. Countrywise interested 3.1m (13.6%) an hour earlier at 8pm (+1: 116k/0.5%).
A Mrs Brown's Boys repeat amused 4.85m (21.3%) on BBC One at 9.30pm, benefiting from a strong EastEnders lead-in. Panorama logged 3.06m (13.2%) at 8pm.
Over on BBC Two, University Challenge managed 2.25m (9.8%) at 8pm, 1.69m (7.3%) watched Lorraine's Fast, Fresh and Easy Food, and The Riots: In Their Own Words mustered 943k (4%).
Overall, BBC One topped primetime with 22.8%, beating ITV1's 21.8% (+1: 0.8%). BBC Two claimed third place with 5.6%, ahead of Channel 4's 5.4% (+1: 0.8%), and Channel 5's 4.8% (+1: 0.2%).
Elsewhere, The Premier League's Most Amazing Moments was one of the evening's most-watched multichannel show with 712k (3.2%) for BBC Three between 8.30pm and 10.30pm.
BARB ratings data supplied by Attentional