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Agar is still hungry for his first wicket

Ashes star debutant Ashton Agar says he is 'very, very happy' with his performance, but is still hungry for his first wicket.

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England has received an apology from the inventor of Hot Spot over the contentious umpiring decision that it claims robbed it of Jonathan Trott’s wicket in the first Ashes Test.

Trott was judged leg before wicket first ball to Mitchell Starc by TV umpire Marais Erasmus during a critical patch of play before tea on day two at Trent Bridge.

COntroversy: England's Jonathan Trott awaits a review of his dismissal.

The moment: England's Jonathan Trott awaits a review of his dismissal. Photo: Reuters

The original decision, from on-field umpire Aleem Dar, was not out but the Australians asked for a review under the Decision Review System.

Fast bowler Jimmy Anderson said Trott was adamant he edged the ball onto his pad, and the decision was made despite there being no compelling evidence about a nick, and in the absence of a side-on angle from Hot Spot.

It was reported on Friday that ICC chief executive Dave Richardson had apologised to his England and Wales Cricket Board chairman Giles Clarke, while London’s Daily Telegraph newspaper also quoted the inventor of infra-red imaging system Hot Spot saying he regretted the episode.

England's Jonathan Trott leaves the pitch after his controversial dismissal.

England's Jonathan Trott leaves the pitch after the decision. Photo: Reuters

Warren Brennan said the Trott wicket was missed by the Hot Spot camera because the broadcaster, Sky, was replaying the dismissal of Joe Root a ball before.

"Here is the absolute truth from our perspective in regard to the Trott incident," Brennan said. "It was operator error. My operator did not trigger the system in order to cater for the Trott delivery.

"Instead, the operator sat on the Root delivery in order to offer a replay from the previous ball and did not realise until it was too late that he should have triggered the system for the Trott delivery as the priority.

Confident appeal: Ashton Agar survives a stumping by England's Matt Prior after a video referral.

Confident appeal: Ashton Agar survives a stumping by England's Matt Prior after a video referral. Photo: AP

"Simple mistake, something that anyone could have made, but my Hot Spot operator has worked on the system since 2007 and to my knowledge this is the first serious mistake he has made."

England management was furious with the decision, that saw Root and Trott fall to consecutive Starc balls before tea, reducing the home team to 2-11 in the immediate aftermath of Ashton Agar's astonishing last-wicket stand with Phillip Hughes to give Australia an unexpected first innings lead.

"Trotty's hit the ball, and he's been given not out so it's very frustrating," Anderson said. "You have to ask the umpire about that. He was given not out on the field and it was frustrating that it got overturned. I'm not sure what went on."

Controversial call: Mitchell Starc celebrates taking the wicket of Jonathan Trott.

Controversial call: Mitchell Starc celebrates taking the wicket of Jonathan Trott. Photo: Getty Images

The English were already frustrated that a fervent stumping had been turned down when Agar was on six. Had it been granted Australia would have been bowled out for 133. "I thought it was out but I saw it on the big screen. It's hard to tell sometimes. He [wicketkeeper Matt Prior] was pretty confident it was out," Anderson said.

On day one Chris Rogers was judged lbw when he reviewed unsuccessfully. Because Hawkeye showed part of the ball clipping the stumps, the umpire's original decision was upheld.

Anderson said Alastair Cook and Kevin Pietersen, unbeaten on 37 and 35 at stumps, would have to make the most of a placid batting pitch to give England a chance of winning the game.

Steve Smith of Australia walks out to bat during day two of the 1st Investec Ashes Test match between England and Australia at Trent Bridge Cricket Ground. Click for more photos

The Ashes: Australia v England, Day 2

Steve Smith of Australia walks out to bat during day two of the 1st Investec Ashes Test match between England and Australia at Trent Bridge Cricket Ground. Photo: Getty

"The pitch doesn't look to be deteriorating that much. I saw a few balls that spun from Swanny, nothing from the seamers has really gone up or down. First and foremost we've got to bat very, very well tomorrow to get in any position to win this game."

Agar, the teenaged No.11 who rescued Australia from a desperate position, was bullish about Australia's chances of taking a 1-nil series lead.

"I think if we can break the partnership the power will definitely be in our hands," the 19-year-old said.

Not happy: Jonathan Trott walks from the pitch.

Not happy: Jonathan Trott walks from the pitch. Photo: AP

"It's a pretty good wicket, especially to play the quicks on, and there's a lot of time left in this game. So if we can get through them tomorrow I think we can win this game."