Australia playmaker Bernard Foley has described his standout performance against England at Twickenham as among the finest of his Test career.

Foley scored 28 points to guide the Wallabies to a 33-13 Rugby World Cup win over England, consigning the hosts to the tournament scrapheap after just three games.

The subject of selection debate right up until the opening whistle, Foley has now ensured he will start against Wales at the same venue on Saturday night, with his performance against England set to go down in the pantheon of great games from Australian fly-halves.

"It's definitely up there, to beat England at Twickenham, and it's the first time I've done that," Foley said on Tuesday. "It's definitely high in achievements in my Test career.

"It instils a bit of belief in what we've been doing, that the ground work that we've put in is paying off. It comes back to the coaching staff and how they've prepared us and how they've prepared the team to go out there and put in such a polished performance on the big stage."

Australia have rocketed up the World Cup pecking order following their win over England, the Wallabies only now trailing defending champions New Zealand as tournament favourites.

But the Australians aren't looking any further than Saturday night's final pool clash with Wales -- the match set to decide who tops the group and books a date with the second-placed team from Pool B.

Australia assistant coach Nathan Grey said: "That's something we can't control. We're very focused on our improvement day by day and I know that does sound a bit boring but it really is the absolute honest approach to what we're doing.

"We've got our session planned for today and we want to focus on the players improving their performance and their preparation today. We can't control the things outside of that but what we can control is how we train, how we prepare and that's our focus."

While Foley's performance was unexpected, arguably a bigger surprise was the way in which the Wallabies forwards dismantled England's pack at scrum time. Buoyed by that demolition job, they will be out to repeat that performance and achieve what has become their tournament buzzword - consistency -- against a Welsh scrum that endured some troubles against Fiji.

Grey wasn't buying into talk the Welsh scrum was weak, choosing instead to point how the benefits of an extended period of rest.

"Their scrum's been pretty solid," he said. "They've had a lot of injuries and their performances across the competition have been pretty consistent and that's something, as a coach, that you look for and Warren [Gatland] has certainly got the guys humming.

"And they've had a good break since their last game so they're going to be nice and fresh and ready to go."