He followed up a straight six off Broad with a reverse sweep for four in Adil Rashid's first over.
He collected nine fours and a six in his 90-ball innings before he was bowled missing an attempted reverse sweep off Hiren Varaiya.
Lancashire lost Lou Vincent cheaply but opener Mal Loye hit five fours and a six before he top-edged a reverse sweep to point for 32.
But after he was out top-edging a reverse sweep off Patel to Ambrose, the rest of the batting line-up struggled to provide Powell with sufficient support.
It was Lendl Simmons who applied the brakes, introduced for the 13th over and striking with his third ball when Jayasuriya missed with an attempted reverse sweep.
Compton missed out on a century when he was bowled attempting a reverse sweep but England A's total of 251-8 gave them a 99-run lead at the close.
Tillakaratne Dilshan lifted the hosts past the 200-mark with an enterprising 44 from 46 balls before being bowled in the penultimate over while attempting an ambitious reverse sweep.
Simmons collected 4-19 from his three overs of medium pace, Dilshan falling in the 18th over when another reverse sweep only found the tall figure of Sulieman Benn at backward point.
Eoin Morgan began his innings with a reverse sweep for four and Collingwood strode down the pitch to hit another massive six off Morkel, before top-edging a skier that Boucher accepted safely.
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The first ball of the next over was launched high down the ground by Guptill and cleared the sightscreen, while three fours in an over from McCullum, the winning hit a nonchalant reverse sweep.
Hayden was badly dropped by Mahendra Dhoni off Harbhajan on 30, and had added only five when Rahul Dravid at slip put down a tougher chance off an attempted reverse sweep against the same bowler.
Strauss brought up the fifty in the 14th over with a pull for four, but with his confidence increasing he attempted a reverse sweep off super sub Brad Hogg and was expertly caught by Gilchrist.
Shah finally struck a couple of sixes, but Collingwood then lost two of his stumps to a Jacques Kallis delivery that he could have hit for four and in the next over James Foster was caught attempting a reverse sweep.
From 106-0, when an injudicious reverse sweep cost Strauss his wicket, England slumped to 141-5 and although they reached their target with 10 overs to spare, it was somehow fitting that they should finally stumble over the line courtesy of a no-ball.
Roach, who edged off Steyn to Mark Boucher, fell two overs later for just two, and Benn, who struck two fours and two sixes in 24, was out after attempting an outrageous reverse sweep which landed in the hands of the gratfeul Hashim Amla.
But just as Strauss was set to reach his half century, he once again needlessly gifted his wicket away, top-edging an attempted reverse sweep off Hauritz to Johnson at short fine leg - the fifth time the off-spinner had claimed his wicket in the series.
He collected nine fours and one six - an outrageous scoop over wicketkeeper Luke Ronchi off Shaun Tait's bowling - but his dismissal, lbw trying to reverse-sweep David Hussey, all but ended the tourists' bid for victory.
Yuvraj kick-starts the scoring with a reverse paddle sweep for three, but his captain is woefully wafting at air from Sulieman Benn's first over, Dhoni now has 11 from 21 with a couple of pushes into the covers.
Williams was honoured as the Six Nations Player of the Tournament when Wales won the 2005 Grand Slam and then helped inspire the Welsh to a second clean sweep in 2008 after Gatland persuaded him to reverse his international retirement plans.
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