Harlequins back row and England captain Chris Robshaw admitted his side felt like they had let the nation down after defeat to Wales.

Wales fly half Dan Biggar - named man of the match - kicked 23 points to add to a second half Gareth Davies try to give the Celts a famous 28-25 win in front of a rabid Twickenham crowd on Saturday.

England had led 19-9 through a Jonny May try and 14 points from Owen Farrell, but they were unable to secure a decisive advantage in the second half.

Indiscipline kept the Welsh in the game and eventually saw them grasp the lead through a Biggar penalty with six minutes remaining, having already drawn level through Davies' try under the posts.

Robshaw's decision to pass up a tough kick at goal in the dying minutes to draw the game, in favour of an attacking lineout and a shot at the win, proved costly.

"The call comes down to myself," said the skipper.

"I spoke to the kickers. It was a tough kick and we wanted to go for the win. We felt we had good ascendancy in the drive, but it did not come off.

"We feel like we have let a lot of people down in the way we did not close out the game.

"It is all about what happens next. We've got a huge challenge in Australia and we have to move on pretty quickly."

England must beat Australia and Uruguay to be certain or reaching the knockout stages and head coach Stuart Lancaster admitted next week's clash was effectively all or nothing.

"It is knockout rugby now. Wales have to play Fiji and Australia, but our game against Australia is a knockout match really," he added.

"There is still plenty to play for. France lost two pool matches in 2011, got 11 points and still made the final, so bonus points could yet play an important part."