Former England captain Alastair Cook says his side suspected Australia tampered the ball during the most-recent Ashes series.
Cook was recently asked whether he suspected Australia were tampering the ball during their comprehensive Ashes victory, and admitted that the reverse Australia gained was a "little bit" suspicious.
"Yes a little bit, certainly in Perth when the outfield was wet with rain they got the ball reversing," he told cricket.com.au
"I didn't see anything. We have been pretty good at managing the ball to see if we can get it to reverse swing but then there's the thing with the quicker you bowl the ball it reverse swings more.
"That was the thing in 2005, we had Simon Jones and Freddie (Andrew Flintoff) who were quicker than the Australian bowlers.
"We have to be very careful, we were curious at certain moments but then we couldn't get the ball up to 90mph where they consistently could."