The Savoy, following the preparations for the London hotel's reopening after a £220m refurbishment, averaged 5.44m (20.9%) for ITV1 from 9pm.
The programme comfortably beat the latest episode of BBC drama Accused, which entertained 3.69m (14.2%) on BBC One in the 9pm hour.
Elsewhere on BBC One, The One Show appealed to 5.14m (22.2%) from 7pm, before Inside Out grabbed 3.76m (14.9%). Panorama: Baby P - In His Mother's Words was watched by 2.33m (8.5%) from 8.30pm.
Countrywise Kitchen cooked up 3.86m (14.4%) on ITV1 between 8pm and 8.30pm.
Over at BBC Two, This World: Flood Doctor mustered 820k (3.4%) in the 7pm hour, before University Challenge and Miranda grabbed respective audiences of 2.79m (10.4%) and 2.85m (10.3%) in the 8pm hour. Ian Hislop's Age of the Do-Gooders fetched 1.81m (7%) from 9pm, before Grumpy Old Men returned with 1.51m (7.2%) from 10pm.
On Channel 4, a repeat of Heston's Christmas Feast fetched 900k (3.3%) in the 8pm hour and 250k (1%) on +1. It was followed by River Cottage Christmas Fare, which had 2.28m (8.8%) and 290k (1.5%) on timeshift. Alan Carr: Chatty Man entertained 1.46m (8%) from 10pm, while 257k (2.6%) watched the show an hour later.
Channel 5's How Do They Do It? attracted 782k (3.1%) from 7.30pm, before The Gadget Show: Christmas Special averaged 1.16m (4.3%) in the 8pm hour. Extreme Fishing With Robson Greene caught 1.11m (4.3%) from 9pm. It was followed by a screening of Sudden Impact with 870k (6.5%).
Overall, ITV1 won primetime with 26.6% against BBC One's 19%. BBC Two came in third with 7%, followed by Channel 4 with 5.7% (+1: 0.8%) and Channel 5 with 3.8%.
Elsewhere, Coverage of Manchester United's Premier League victory against Arsenal was watched by 1.92m (7.6%) on Sky Sports 1 from 7pm.
BARB ratings data supplied by Attentional