Leicester Tigers fly-half and England captain George Ford admitted poor discipline hurt England in their bid to record back-to-back victories over long-time international rivals Wales on Saturday afternoon in Cardiff.
The English side were penalised on 12 occasions under the roof in the Welsh capital and outplayed across the park by the home side, who kept Ford and his team-mates try-less in the World Cup warm-up fixture in front of more than 70,000 supporters.
"It is a disappointing result ... but I cant fault the effort of the lads today," Ford said post-match.
"That was a proper Test match, pretty physical and not much time and space available."
Ford was one of the standout performers in England's dominant victory over the Welsh less than a week ago at Twickenham, where Eddie Jones' men blew Wales off the park from the opening minutes through until the final whistle.
What happens at the World Cup will be completely different and we'll make sure we're ready for that
However, after a slow start in Cardiff riddled with errors of their own making at the breakdown and ill-discipline, the 26 year old called on his England team-mates to "tidy up" areas of their game heading in to a clash with Ireland next weekend in London.
"We need to tidy up a few areas ... the discipline and breakdown in particular," said Ford.
"We knew Wales were going to come back and play a better game this week.
The Welsh victory sees England's arch-rivals move in to the number one spot on the World Rugby rankings, which Ford was questioned about following the loss at the Principality Stadium.
"I don't think people will remember these games," responded Ford.
"What happens at the World Cup will be completely different and we'll make sure we're ready for that."