Dylan Hartley conceded that Elliot Daly's late try should have come much earlier
A late Elliot Daly try gave England a 21-16 win over Wales in Cardiff in a game in which they were behind for the majority.
They beat France by an even smaller margin last week and despite having two wins from two in the championship so far, captain Hartley concedes that they are not at their best.
"We showed good examples of what we can do today," Hartley said.
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"I'd have preferred that we'd have wrapped it up a bit earlier but the finishers came on and added loads to the game.
"There are parts of that game that we have to look at and improve.
"It was self-enforced pressure a lot of the time, not being able to get out of our half.
Dylan Hartley had a long chat with his players on the pitch after the game
"Wales put us under unbelievable pressure in that area.
"It's something we have to learn from but we'll take that one.
"It's unbelievable character from the guys.
England rose to the occasion at the Millennium Stadium in Cardiff
"They believe and they'll play for the full 80 minutes."
England lock Joe Launchbury was awarded the man of the match award for a relentless physical performance but he was matched by a number of Welshman.
The back row of Ross Moriarty, Sam Warburton and Justin Tipuric expertly controlled the breakdown while Dan Biggar, playing with bruised ribs that nearly kept him out, was instrumental in everything Wales did with the ball.
"Full credit to Wales," Hartley added.
"That was an unbelievable challenge.
"We knew physically they'd be there and they showed that from minute one to minute 80.
"It was a hell of Test match."
Hartley himself did not even make it to the 50-minute mark.
He was replaced by Jamie George with just after half-time but the New Zealand-born hooker refused to be disappointed with his early withdrawal.
"I want to play as long as possible but I'm sure the substitution was for the good of the team," Hartley said.
"The substitution comes from up top and it's something I have to deal with.
"If it's for the team, that's the main thing."