Iain Balshaw says England are yet to peak as they prepare to do battle with South Africa in the Rugby World Cup final on Saturday.

Eddie Jones' side dethroned New Zealand with a magnificent performance at International Stadium Yokohama last weekend, setting up a showdown with the Springboks seven days later.

The Red Rose are favourites to lift the Webb Ellis Cup for the second time after dominating the two-time defending champions.

Balshaw, part of the squad for England's only World Cup triumph in Australia 16 years ago, believes there is more to come from the current crop ahead of the biggest game of their lives.

He told Omnisport: "I'm not sure exactly what the average age of the England squad is, but I'd guess around 27, and the majority are coming into their prime.

"We've seen young players like Sam Underhill and Tom Curry come in and be outstanding and they have years ahead of them, they will only get better.

"I think these are such exciting times for English rugby, not only looking at the players who are out in Japan, but also those who did not make the squad and the strength in depth there is.

"There is great talent in the Premiership and academies, the game really is in great shape in England."

Balshaw said England must match the Springboks' physicality and be prepared to mix up their game if they are to emulate the class of 2003.

The jet-heeled former back added: "You've got to meet fire with fire. You have to be prepared for that big first collision and make sure you execute the plans that have been put in place.

"England have done that really well so far, they have been so well drilled and been expansive, but if they need to win playing boring rugby, then so be it. When you get into a final, winning is all that matters."