LOCK Joe Launchbury admitted England must improve following Sunday's unconvincing 36-15 RBS 6 Nations triumph over Italy.
Despite Dan Cole's early try, Eddie Jones' men trailed 10-5 at the interval before second-half scores from Danny Care, Elliot Daly, Jack Nowell (two) and Ben Te'o secured victory and a bonus point at Twickenham.
The win moved England back to the top of the championship table and kept alive their hopes of a second successive Grand Slam.
"It was a very frustrating first half," said Launchbury. "Obviously Italy came with a plan around the break down and it took us quite a long time to work that out. Obviously pleased with the result but, as always, lots to work on.
"I think we knew the challenge ahead today. I think we knew Italy would come very passionate and fired up and they certainly didn't disappoint in that area.
"We let ourselves down in a couple of areas so we'll have a good look over the next couple of weeks and come out firing in a couple of weeks.
"It's a win and it's a tough competition so we're delighted with that.
"The benefit is that we've got two weeks now to address the issues and look forward to a really big game (against Scotland)."
Italy coach Conor O'Shea was pleased with his side's display and believes they should be taken more seriously in the competition.
The Italians remain bottom of the table following three successive defeats.
"We have a massive job to do but we will do it and we have to think differently like we did today," he said.
"We didn't come here to make up numbers.
"But you're playing against a brilliant team who are on-form and they worked their way through it.
"We thought we might come away with a bonus point but we're here not to be plucky losers.
"We're learning at the highest level and hopefully we've earned a little bit of respect here today."
England head coach Eddie Jones was unhappy with Italy's tactics, including their refusal to form rucks.
"Congratulations to Italy, strategically they were smart today, but it's not rugby so let's be serious about it, it's not rugby today," Jones said.
"I'm not happy what happened today, I don't think that's rugby. I played rugby a long time ago, I've coached rugby. I understand what Italy did and I'm not angry with what they did, but I just don't think it's rugby."
Jones also said he was pleased with England's progress in the tournament.
"We're exactly where we want to be in the competition, if you said after three rounds we'd be undefeated with one bonus point we'd be doing handstands," he added.
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