'Obviously I'm delighted at pulling this one off, and I'm looking forward to the rest of the season,' said Stenson, who won his second European Tour crown. 'My plan was to do the best I could on every shot and I'm just delighted. The Ryder Cup was inspiring and I came out with some great golf this week.'
Spain's Carlos Rodiles tried to put pressure on Stenson with a 7-under 65, but it wasn't enough as he finished second at 15-under-par 273. Patrik Sjoland managed a 1-under 71 to take third at 13-under-par 275, Anders Hansen climbed into fourth at minus-12 with a closing 65.
Stenson got his round going with a 10-foot eagle putt at the par-5 fourth. He played that hole at 6-under par for the week with two eagles and two birdies.
The 28-year-old tripped to a bogey at the sixth to drop to minus-14. Stenson got that stroke back with a seven-foot birdie putt at the ninth and came back with a short birdie putt at the next to get to 16-under.
Stenson stumbled to a three-putt bogey at the par-5 13th on the Duke's Course at Woburn Golf and Country Club. His lead was still two at that point, but it was about to grow.
The 2001 Benson and Hedges International Open winner drained a 14-footer for birdie at the 14th. He then rolled in a long birdie putt at 15 and sank another 14-foot birdie at 16 to jump to 18-under.
Stenson made it four in a row as he dropped in a birdie at the 17th. He closed with a two-putt par to finish four clear of Rodiles, who climbed from ninth to second with his 65.
'My game has been pretty good over the summer, then it got a bit rusty after a couple weeks off,' Stenson said. 'I played a great long game and the putter was working pretty good over the last few holes.'
Rodiles got his round going with a birdie at the fourth, his fourth in four rounds on that hole. He slipped to a bogey at the sixth, but came back to birdie No. 8
The Spaniard dropped in a birdie at the 10th, then converted back-to-back birdies from the 12th to get to 12-under. Rodiles sank a birdie on 15 and again drained consecutive birdies from the 17th to climb into second place.
Stephen Dodd closed with a 6-under 66 to finish at 11-under-par 277. He shared fifth place with Barry Lane (67), Phillip Price (70) and Simon Wakefield (72).
Gary Murphy posted the low round of the week as he finished with an 8-under 64. He tied for ninth with Ian Woosnam, Alastair Forsyth, Mikko Ilonen and Nick O'Hern.
David Howell was the top finisher of the four European Ryder Cup players. He finished at 7-under-par 281 after closing with a 5-under 67.