Steve Harmison's new work ethic has brought great results

Harmison had struggled for consistency in his previous 13 Tests, but he claimed a career-best 7-12 as England marched to a 10-wicket win in Jamaica.

He said: "I think what has changed in him and a few of the guys is all from the hard work we started in Bangladesh.

"Suddenly the message has got through that a lot of hard work is required."

England have adopted a tough fitness regime since Michael Vaughan took over as captain at the end of last summer.

Gym visits after a day's play are common practice while nets have been more intense than in recent years.

And Harmison even maintained the new hard work policy during his time on the sidelines recovering from the side strain which caused him to miss the tour of Sri Lanka.

Most sides need a guy with pace and bounce and he's got another dimension in that he can swing the ball Duncan Fletcher

He trained several times a week with his beloved Newcastle United in addition to training with the England A team at the Academy centre in Loughborough.

Fletcher said: "I had a chat with him after the match finished on Sunday and told him that this hard work will always be beneficial to them as individuals and as a team at some stage.

"This was probably the start but the hard work doesn't mean just keeping fit, it means working at your game, trying to change your game and improving it - you can't stand still."

The gangly Durham paceman has struggled to assert himself since making his Test debut against India at Trent Bridge in 2002.

But he has now claimed 22 wickets in his last three Tests and it looks as if England's perseverance has been rewarded.

"It was about three years ago when we realised that this was the guy that England needed and needed badly.

"Most sides need a guy with pace and bounce and he's got another dimension in that he can also swing the ball. He's a very good bowler," added Fletcher.