England must show greater consistency if they are to replace New Zealand as the number one side in world rugby, says coach Eddie Jones.
Jones' men completed a 3-0 whitewash in their Test series with Australia with a thrilling 44-40 victory in Sydney on Saturday.
It is now nine wins from nine for Jones as England coach, adding the sweep of his home nation to a Six Nations Grand Slam and a Test win over Wales.
But Jones was far from satisfied with England's performance in the series finale and believes improvements are needed to dethrone the world champion All Blacks.
"We weren't at our best, we had a number of players sub-par. It was a fantastic effort from the squad to beat a very good and determined Australian side," Jones said at a media conference.
"We're pleased with the 3-0 result but we realise we have a lot of work to do. We were inconsistent in our defence. We've had two very poor games in defence and one very good game.
"If we want to be the number one side in the world, which we do, we need to have greater consistency in that.
"Our set-piece gave us a significant advantage in the second half, so we're pleased about that and just pleased about the general attitude of the players.
"To come here, they've been training since June last year. They started pre-season in June and haven't had a weekend off, that is a fantastic effort and to win at the end of that game was a superb effort.
"They showed fitness, they showed toughness and they were brave. So it's a great start for us but it's only a start, we realise that.
"If we're aiming to be the best side in the world, which we're aiming to be, we've got to be much more consistent and we'll get that, we'll work very hard to get that over the next three years."
Jones is confident the manner of England's series win will take some of the attention away from the financial implications of the United Kingdom's exit from the European Union.
He added: "It was a fantastic series, wasn't it? Three really cracking games, it's brought rugby more into the sports landscape in Australia. I'm sure people in England will maybe be talking less about the pound devaluing and more about the value of the England rugby side going up."