Boycott lauded England's terrific performance in the fourth Test at the Old Trafford which the home team won by an innings and 54 runs inside three days to take a 2-1 lead in the series and turn their fortunes around after the disaster at Lord's.
He, however, issued a warning bell and said there are still areas -- back up seam bowling, opener Sam Robson's form and English batsman's ability to handle short balls -- where Alastair Cook's side must improve.
"They have to look at the quality of their back-up seam bowlers, address the weaknesses of opening batsman Sam Robson and all our batsmen have to improve against the short ball.
While Boycott is not impressed with back-up seamers Chris Woakes and Chris Jordan, he also questioned opener Robson's place in the team.
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"When England's back-up seamers - Chris Woakes and Chris Jordan - were bowling at Old Trafford there was a huge difference in quality, aggression and control. There was a release of pressure on the opposition batsmen," he said.
"His (Robson's) judgement on what to play and what to leave around off stump is suspect. He gets out caught in the slip cordon or playing no stroke. The better the new ball bowler, the more balls he will put in the corridor of uncertainty at pace," said Boycott.