Jack Nowell knows England must be more disciplined if they are to have any chance of winning their first Six Nations title for five years.
England started life under Eddie Jones with back-to-back away wins against Scotland and Italy to go top of the table.
Defending champions Ireland visit Twickenham a week on Saturday and wing Nowell said there is plenty of room for improvement from Jones' men.
He said: "We are always happy to be winning but the most pleasing thing for us is that we aren't perfect. We have things to work on still and we know what we need to work on as well.
"So these extra three days are massive for us. Straight away we did our Italy review the day after and put that to bed and focus on the Ireland game now so it gives us a few extra days to let us focus on what we need to do for the next game.
"Like Eddie said, the fitness for us was a big thing so we have been doing those little extras. Our discipline hadn't been great and we know that as a squad that it needed to get better.
"[Ireland fly-half Jonathan] Sexton's kicking, he has got a good boot so that's a big thing for us to work on and our breakdown skills that we have been working on since the Scotland game.
"We lost too many balls and for us to be attacking the way we want to we need to keep going.
"Every game in this Six Nations is going to be a tough game and we have worked extremely hard to get these wins, but now that has passed and the big thing we work on now is the next game coming up and we have said that since the start of the tournament.
"So when we played Scotland we didn't look past that, and same for Italy. Now we have to tick those two games off and now we aren't looking past the Ireland game because that's our next physical battle and the next task.
"I think that has been working well for us and as long as don't forget that then it will go alright."