South Africa's physical approach took its toll on England

The two sides will meet on 14 September in a key World Cup group match.

"We've won a Test series, scored over 100 points and got 15 tries in the process, some from structured play and some from broken play," said White.

"I think it's going to definitely have a psychological impact going on to the World Cup."

In Saturday's second Test England, who were well below full strength, took a surprise 19-17 lead into the break, but South Africa overpowered the tourists as they ran in five tries in the final 30 minutes.

White admitted he had spoken "sternly" to his players during the half-time interval.

"This is a talented bunch of players and I told them it was up to them and they just turned it around," he said.

"We made it more difficult than it should have been because of silly mistakes, but we built up a lot of momentum in the second half and that will stand us in good stead going forward."

I found the interpretation at the scrum very frustrating - and also a bit dangerous John Smit

South Africa captain John Smit was also delighted with the 2-0 series win, which the Boks won by an aggregate score of 113-32.

"If someone said before these Tests we would have two 50-pointers, we would have signed on the dotted line," said Smit.

"We're chuffed with the result but it was certainly a much better performance from England.

"The first half was very frustrating then all of a sudden we started playing a bit more directly and then there was a bit more momentum on our side."

But the hooker said he had been unhappy with the handling of the scrums at Loftus Versfeld by referee Joel Jutge, who will also officiate in the World Cup fixture

"I found his interpretation at the scrum very frustrating - and also a bit dangerous," said Smit.

"Scrum after scrum went down and last week it took me until Thursday to start feeling my neck again so I just worry from a safety point of view about how it is being reffed."

Nevertheless, Smit said he was confident the wins over England had set his side up for a good showing in the forthcoming Tri-Nations and World Cup.

"We're certainly on track for the World Cup, but the key is to stay on track and not sit down on the side of the road," he said.

"If I look back to the last World Cup, at this stage we were in disarray but now we've had three years of back-up and preparation and consistency in selection."