England captain Alastair Cook admits his form is a concern going into Friday's second and final Test against Sri Lanka at Headingley.
Cook, who scored just 17 and 28 in last week's drawn first Test at Lord's, is desperate to rediscover the form he showed in the early days of leading his country.
In his opening 11 Tests as skipper, the opening batsman scored 1,311 runs compared to just 568 in his last 11.
"It is a concern, it's crucial that I get back to scoring as many runs as I can," he said.
"I'm doing all the hard work and I just have to score the runs in the middle. I saw a stat on my batting where the first 10 or 12 games as captain I scored six or sevens hundreds and in the next 12 games I scored seven 50s and no hundreds.
"So the real difference is I haven't been converting those chances into big scores which I did at the beginning of my captaincy.
"That's the frustrating thing for me and I'm doubly determined to lead from the front and try and get a score."
And Cook is confident England can build on the impressive performance at Lord's where Sri Lanka's final-wicket pairing stubbornly held out for a draw.
"We played really well there but that's gone and we have to start again," he said."We have to earn the right to get into the positions we put ourselves into at Lord's.
"We eventually dominated Sri Lanka but it took four-and-a-half days of really hard work to do that and I expect nothing different this week.
"We have been pushed in all the one-dayers, and at certain times during the Test match as well, but we want to win this game, we want to win the series, and to do that we have to play some good cricket."
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