England deliberately scuffing the pitch?

I wasn't able to watch or listen to England wrapping up a 4-0 series win yesterday, but having got the first wicket it looks like England dominated (again). To think, prior to the series I was upset that the battle for number 1 Test nation wasnt' a 5 match series - in the end it all seemed very easy for England.

But one thing seemingly glossed over in victory worried me - did I read that Strauss was officially warned about his players continually walking on the pitch? If that is true, that sounds extremely worrying. Nothing Afridi-esque I assume or it would be far more important than the one line of coverage it seems to be getting....