The two-hour finale, which aired on ITV1 from 8.30pm, improved by around 500k on the climax to last year's series, won by Joe Swash.
ITV2's spinoff programme I'm A Celebrity, Get Me Out Of Here Now! followed with 1.19m (7.8%) from 10.30pm.
Before Celebrity on ITV1, a special Tonight report on singer Russell Watson's health battles interested 3.47m (15.9%).
A Question Of Sport logged 3.71m (15.9%) for BBC One at 8.30pm, then Have I Got News For You - this week guest hosted by Jo Brand - put in 4.61m (18.7%). Live At The Apollo had 3.89m (16.1%) at 9.30pm.
A Gardeners' World special brought in 1.56m (6.9%) to BBC Two in the 8pm hour, then the next episode of documentary We Are Family was seen by 560k (2.3%).
Repeats of Jamie At Home garnered 1.03m (4.7%) and 1.38m (5.9%) for Channel 4 in the 8pm hour, then documentary Waking The Baby Mammoth averaged 1.41m (5.9%) over 90 minutes.
On Five, Axe Men appealed to 772k (3.4%) at 8, after which reruns of NCIS and Law & Order: SVU picked up 937k (3.8%) and 829k (4%). An encore screening of Monday's FlashForward had 438k (3.5%) from 11pm.
ITV1 led primetime overall with an average share of 34.2% to BBC One's 20.4%. Channel 4 was third with 4.6% (+1: 0.6%), followed by BBC Two with 4.6% and Five with 3.1%.
BARB ratings data supplied by Attentional