Michael Clarke has insisted that Australia will not "overstep the mark" when they face England in the Ashes this summer.
The Aussie skipper is confident that the series will be played in the right spirit, after his side arrived in England on Wednesday to begin their preparations.
"I know I probably say this every series, but we respect there's a line you can't cross," said Clarke, speaking at a press conference.
"Both teams might 'head-butt' that line, but I'm confident we won't overstep the mark."
Australia are looking to defend the Ashes in England, having whitewashed Alistair Cook's men 5-0 in 2013-14.
