Kevin Pietersen: Andrew Strauss calms Twitter row

England captain Andrew Strauss has tried to calm the Twitter row involving Kevin Pietersen.

Batsman Pietersen was fined an undisclosed sum by the England and Wales Cricket Board following criticism of commentator Nick Knight on Twitter.

But Strauss hopes the fine has resolved the matter.

"The Twitter thing is a difficult issue and there's a line to tread. As players there are certain things we can't comment on," Strauss said.

"Sometimes we've got to be a bit economical with what we say."

Strauss explained that the players' contracts restrict what they are allowed to say in public.

"We have conditions of employment that don't allow us to talk about everything and anything," he explained.

"We can't criticise the ICC, we can't criticise umpires and in this case the board wasn't happy with Kevin's comments with regard to our broadcaster.

"That's their right as a board, so Kevin has obviously received a fine because of that.

"You can understand that the board is concerned with making sure their sponsors and broadcasters are looked after.

"That's the way of the world. If you sign an England contract you can have opinions on certain things but can't say them publicly. That's the way it is and there are good reasons for that."

England head into Friday's second Test at Trent Bridge hoping to build on their fine victory in the series opener at Lord's.

They overcame West Indies by five wickets in an impressive start to the summer.

But Strauss feels that the first Test showed that the visitors pose a signficant threat.

"It's so easy to get carried away after winning a game," he said.

"If Lord's taught us anything, it's that the West Indies are a side very much to be respected. If we do win, we'll deserve it because we'll have had to play some pretty good cricket.

"No-one has a God-given right to win a Test match. It's about hard work and West Indies showed glimpses of being quite obdurate and difficult to dislodge at times.

"We've just got another five days of very hard work ahead."

England paceman Stuart Broad took 11 wickets in the first Test and is hoping conditions at Trent Bridge will give him even more help.

"It's an exciting cricket wicket," he told BBC Radio 5 live. "If you bat well you can score 100, if you bowl well you can take wickets. It's a good battle between bat and ball. The outfield is so fast here you get great value for runs and you have to play great cricket to win Test matches here.

"Lord's was particularly slow and was very hard to drag anyone into a false shot if they play disciplined. Trent Bridge plays a little quicker and tends to be a pretty true so I'm hoping for a bit of pace and bounce."