England lock Danny Grewcock believes winning is a habit and one victory merely increases the hunger for more.

A superb 25-17 victory against South Africa at Twickenham, preceded by
victories in successive weeks against world champions Australia and Argentina, revealed England's progress as a world force and showed they can compete against the southern hemisphere teams.

But 28-year-old Grewcock said that defeat against the Springboks would have undermined the two previous positive results.

He said: ``We had got results against Australia and Argentina but that would
have meant nothing if we had lost to South Africa.After winning the first one, there is the desire to go and win the second one and so it was important to get this win to keep the run going.''

It was a bruising encounter with many players forced from the field to receive treatment, but Grewcock revealed that England were always aware of the physical challenge posed by Harry Viljoen's men.

``We knew from the tour to South Africa earlier this year that they are a big,
physical side and it was always going to be hard work for us.They are a bit bigger up front than the Australians and they made it very difficult for us.
We took some big blows and some of the lads received nasty cuts, but most of
them came back on to the field later on and that was a big boost to the rest of
us,'' the Saracens man said.

Grewcock was keen to play down any malpractice by either side and said
crunching tackles are part and parcel of the modern game.``They're big guys so there are bound to be big challenges. We knew we would have to put in a big performance to beat them and I think we came out with lots
of credit from the game.''

The former Coventry man, who produced an outstanding display in the second row alongside skipper Martin Johnson, was keen to praise fly-half Jonny Wilkinson for his contribution to the English cause.Grewcock said: ``Jonny kept us in charge and he continually tucked away the penalties to keep our noses in front.''

The Newcastle Falcons star was once again the thorn in the South African side, scoring 20 of England's points and setting up Will Greenwood's well-constructed first-half try.

Six months ago, Wilkinson produced another awesome all-round performance when he scored all 27 of his country's points in their memorable win in
Bloemfontein.

But despite his outstanding personal form, combined with England's run of four successive Test victories, Wilkinson refuses to get carried away with either.

He said: ``It's a great feeling to have won these Tests but I think everybody
in the squad believes we haven't been as good as we could have been and that
must be a good thing.Doing well with my goal-kicking is great and it justifies the hard work I do during the week.But I need to take time to work at everything else in my game as I don't
just want to be known for my kicking ability.''

Wilkinson, who has won 23 caps for his country, is determined that he and his
country build on recent results, beginning with their Six Nations Championship opener against Wales next year.

The 21-year-old said: ``We've got to move on to our next challenge in the Six Nations and we need to try and develop our game and become a better side.At the start of this series of games our aim was to win them and we have had to pull together as a team to do that.But we need to try and get back to the form of last year's Six Nations and move the ball a bit better.We've got a good squad of players and we just need to keep moving forward,'' he added.