The reigning world champions head to Marseille after booking their last-eight place with a 36-20 victory over Tonga that secured runners-up spot in Pool A.
Unbeaten Pool B winners Australia now await them, desperate to avenge the dramatic 2003 World Cup final defeat when Jonny Wilkinson's late drop-goal saw England land the Webb Ellis Trophy.
England, notably two years ago at Twickenham, have enjoyed a domination of Australia in the scrum, putting a huge onus on Saturday's likely front-row trio Andrew Sheridan, George Chuter and Phil Vickery.
But forwards coach John Wells and scrum specialist Graham Rowntree believe it would be a dangerous game to write off the Wallabies in that key contact area.
Wells said: "There is no doubt their scrummage has taken a good turn.
"Before the tournament, people pinpointed it as a potential weakness, but their scrummage and driving play has come on immensely."
And Rowntree added: "Australia are better in that area than when we played them in 2005, and I genuinely believe they are looking to scrummage.
"I have a lot of respect for Michael Foley (Australia forwards coach). He is one of the best front-row coaches in the world.
"The scrum is no longer just a restart for them. They are looking to take teams on.
"They looked to take Wales on in that area (earlier in the pool stages), and I was disappointed in how Wales reacted to that. It became a penalty competition."
England head coach Brian Ashton is likely to announce his starting line-up on Tuesday.
He will hope that full-back Jason Robinson (hamstring) and flanker Tom Rees (thigh) are available for selection after they were sidelined for the Tonga clash, but England look to have emerged from a punishing encounter without any major fitness scares.
Several of the squad spent their day off at Disneyland Paris before reconvening to begin the task of plotting Australia's downfall.
Wells said: "Over the last two weeks there has been a lot of criticism and the players have had to handle that, but they have dug in and worked hard.
"The two wins over Samoa and Tonga have given us a lot of confidence, but we will have to continue to work hard to improve for the next fixture.
"We have been pilloried in the press, probably at times quite rightly, but we have come through two difficult games against very tough opposition.
"We have achieved our first objective, which was to get out of our group.
"While you are in it you can still win it, and I am confident that if we are on top of our game we can give a good account of ourselves.
"Our confidence is good. Yes, we still need to improve, we know that, but if we keep chipping away and are on top of our game, then I would like to think we could be very competitive."
In Foley and head coach John Connolly, however, the Wallabies boast a coaching set-up that possesses a detailed knowledge of the English game following their time at Guinness Premiership club Bath.
And it is a fact not lost on Wells, who added: "Mike and John have got a good understanding of English players.
"I know the Bath lads hold Mike in high regard as a coach, and he has taken Australia forward."
Australia have lost number eight David Lyons for the tournament with a broken leg, yet England will find themselves selecting from a fully fit squad if Robinson and Rees recover.
Robinson could realistically expect a recall instead of Josh Lewsey, while Ashton must look closely at the inside centre position, where Olly Barkley produced an ineffective display against Tonga before being replaced by the impressive Andy Farrell.