Jamie Roberts stretches the English defence © Getty Images

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Jamie Roberts believes that Wales will need to raise the defensive bar again if they are to overturn South Africa in their opening Rugby World Cup clash.

Having shut England out at the Millennium Stadium on Saturday, the centre has demanded that his team-mates focus on producing similar defensive efforts against Argentina next weekend and against the Springboks in Wellington.

"Come September 11, we play South Africa - a team as physical, if not more physical, than England - and that is the type of performance we are going to have put in, and better it, defensively," he said. "In terms of our defence, we went up another level, and we will be looking to do that again against Argentina next weekend."

Despite their memorable victory, Roberts is keeping his feet on the ground and has not lost sight of the fact that the real challenge begins when Wales arrive in New Zealand.

"It was important we won at home, but we haven't won the World Cup or anything," he said. "It was a warm-up game, although we were pleased with that performance.

"It's great to feel that result against a good team. It has been a long time coming for us, but we stuck at it. We will need to up it again now."

Wales coach Warren Gatland revealed after the game that his players had turned down the opportunity to have a drink in the Twickenham bar following last weekend's 23-19 defeat to England.

"Wales have obviously had a lot of bad press over the last year with drinking," skipper Sam Warburton said."But we made a collective decision that it was best not to drink after the Twickenham game with only the short turnaround of a week.

"We needed to get our recovery in. The best thing was to get back to the hotel and have some good food, bang in the protein shakes and get back to it on Monday.

"We've got a great bunch of boys, and everyone has bust a gut to get this win. It was massive with the World Cup around the corner because, as Warren said this week, we have to get into the winning habit."