Stuart Lancaster hailed his young guns for their record win over Fiji, but admitted England will have to up their game for the arrival of Australia, South Africa and New Zealand over the next month.
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Lancaster named an inexperienced team that contained 11 players with 13 caps or fewer, but they ran in seven tries to complete a steady 54-12 win over the minnows at Twickenham.
Charlie Sharples picked up his first two international tries and Alex Goode put in a sterling performance at full-back, but there were also parts of England's play that will need fine tuning in the weeks ahead.
The red rose started sluggishly in the opening quarter and also failed to capitalise on all the chances they created as Fiji tired towards the end of the game.
And with the top three sides in the world coming to HQ over the next three weeks, Lancaster admits his team must become more ruthless.
"Next week and the week after and the week after that we are going to have to be more clinical," the England head coach said.
"It was good to get the win. We struggled a bit for 10-15 minutes. We didn't convert every opportunity but we were pleased with the opportunities we did take.
"It was a good start but we recognised the quality of the opposition that is coming around the corner. We will have to step up a couple of levels next week.
"Our cohesion is growing and that is what we will need. Australia, South Africa and New Zealand are cohesive and organised, and we will have to be at our best."
Alex Goode excelled at full-back, offering England an effective second play-making option and broadening their attacking game, while Charlie Sharples was unfortunate not to score a hat-trick.
The Gloucester wing, starting in place of the suspended Chris Ashton, scored twice while Ugo Monye on the opposite wing bagged a try on his return to the England team.
Ashton is set to return to face Australia next week, giving Lancaster a selection headache which he welcomes.
"Chris Ashton is back so there are selection decisions to be made. It's not a nightmare at all," Lancaster said.
"It's a great position to be in. Charlie did what we wanted him to. He was excellent in every area. We will now have a long conversation about selection next week.
"Alex played like he does for Saracens, he was excellent under the high ball, his ability to move the ball around.
"It was nice for Alex. He did well in the third Test in South Africa and he has maintained that form."
Tom Youngs made a confident debut at hooker in a dominant England pack.
"I thought he had an outstanding game," said England forwards coach Graham Rowntree.
"He had a 100 per cent lineout and made a huge impact in the loose. To have a game like that on his debut is exciting for us. I can't speak highly enough of him."
Prop Alex Corbisiero and centre Jonathan Joseph will also come into the selection mix next weekend, and Lancaster is confident he will have Danny Care available, despite his yellow card today.
Care was sin-binned by referee Glen Jackson, on the advice of his touch judge, for a dangerous tackle but it seemed a tough call on the scrum-half.
"It was a bit unfortunate, a bit harsh. I don't think there will be a citing or should be," Care said.
Fiji coach Inoke Male claimed his side would have given England a tougher game had all their players been available.
The Fijian Rugby Union lodged a formal complaint with their French counterparts after Racing Metro lock Jone Qovu withdrew from their touring squad.
Qovu had initially claimed he was injured but then played for Racing against Perpignan on October 27.
The French Rugby Federation have banned Qovu from playing for Racing until December 4, which covers Fiji's European tour.
The Pacific islanders play Gloucester on Tuesday and then face Ireland A and Georgia.
"We lost some of the boys earlier in the week. Some of them weren't released by clubs and some were not available until the last minute, about four players," Male said.
"Had they been available we would have given England a game."