England asked the International Cricket Council for clarification after the controversial umpiring decision that saw Jonathan Trott given out lbw for a golden duck.On another extraordinary day at the first Test, Trott was given not out by on-field umpire Aleem Dar but dismissed by third umpire Marais Erasmus despite the key HotSpot camera angle being unavailable to the official.England ended the day 80-2, a lead of just 15, after an early Australia collapse was followed by a remarkable fightback.Pace bowler James Anderson said: "Trotty hit the ball and was given not out on the field. I’m not quite sure what went on after that. It’s pretty disappointing really.”England believe Erasmus should not have overturned the on-field umpire’s decision with the critical replay not available to him.They asked ICC match referee Ranjan Madugalle for clarification over the decision review process.ECB chairman Giles Clarke also spoke to ICC chief executive Dave Richardson about the issue on Thursday evening, but there was no formal apology from the governing body."He did hit it. It is frustrating that it got overturned,” said Anderson."We’re all for technology, because since it’s come in more decisions are given out correctly than wrongly. From our point of view we want it; whatever has gone on today provides a couple of talking points, but on the whole we’re happy to have it.”The day was dominated by a brilliant 98 from teenage Test debutant Ashton Agar, who in a record partnership with Phil Hughes took Australia from 117-9 - a deficit of 98 - to 280 all out - a first-innings lead of 65.Agar made the highest score by a Test number 11, just a few months after turning out for club side Henley CC.He said: "When I walked to the crease I was thinking we were in a little bit of trouble, but the wicket was good."Phil told me to take it ball by ball. We just played the moment and forgot about everything else.