Andrew Strauss has no problems with DRS for Pak series

England captain Andrew Strauss has said his side are becoming increasingly comfortable with cricket's controversial Umpire Decision Review System (DRS).

The system is being used in a Test series in Britain for the first time during the ongoing four-match campaign between England and Pakistan.

"It's still a challenge to know which ones to review and which not to," said Strauss.

"We reviewed one for Graeme Swann that was going down leg and didn't ask for one off Jimmy Anderson that was hitting leg. Everyone is getting more used to the system now

"The umpires don't seem to be taking offence if a decision is overturned and generally we're getting more decisions right on the back of it and that is a good thing," he added.