Peaking with 13.05m (52.5%) as Jai McDowall was announced the winner, the results show was seen by 12.19m (49.3%) at 9.30pm and 300k on ITV1 +1.
From 7pm, the two-hour performance show dazzled 11.18m (47.7%), reaching a high of 12.53m (51.4%) at 8.15pm, and adding 430k on timeshift.
Britain's Got Talent's peak is slightly down on last year's 14.1m, despite the return of a separate results programme.
However, ITV will be elated by the ratings, given that it boosted Popstar To Opera Star, which premiered to 6.28m (27.1%) at 9pm sandwiched between the two Talent showings. Britain's Got More Talent climbed to a series high of 1.83m (9.2%) at 10pm, alongside 175k on ITV2 +1.
Doctor Who's momentous mid-season finale attracted 5.48m (25.4%) to BBC One at 6.40pm. However, this rating will inflate once iPlayer viewers are taken into consideration. BBC Three's Doctor Who Confidential interested 540k (2.3%) at 7.30pm.
Meanwhile, So You Think You Could Dance rumbled on with 2.23m (13.3%) at the early time of 5.40pm, and returned with 2.22m (9.7%) at 9.10pm.
'The Gift of Life' in Casualty logged 3.86m (15.8%) at 8.20pm, while The National Lottery: Who Dares Wins had 2.75m (12%) at 7.30pm, and a repeat of John Bishop's Britain could only amuse 1.42m (5.7%) at 9.30pm.
Screenings of The Lord of the Rings: The Return of the King and X-Men: The Last Stand, part of Channel 4's film night, entertained 1.33m (5.8%) at 6.30pm (+1: 296k) and 1.31m (9%) at 10pm (+1: 212k).
Over on BBC Two, D-Day To Berlin (8pm), Have I Got A Bit More News For You (9pm) and QI XL (9.45pm) pulled in 1.29m (5.3%), 2.17m (9.2%) and 1.53m (6.8%), while NCIS (8pm), CSI (9pm) and CSI: NY (10pm) averaged 663k (2.7%), 969k (4.1%) and 1.74m (8.6%).
Overall, ITV1 owned primetime with 37.9% (+1: 1.3%), ahead of BBC One's 13.6%, BBC Two's 7%, Channel 4's 5.9%, and Channel 5's 4.1%.
Outside of primetime, England's 2-2 draw with Switzerland netted 5.57m (36.8%) for ITV1 between 4.15pm and 7pm, peaking with 7.9m (45%) at 6.15pm.
BARB ratings data supplied by Attentional