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Scrummaging is likely to have a huge effect on RWC 2015 © Getty Images

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Former Wallabies coach Bob Dwyer fears Rugby World Cup 2015 will be blighted by a lack of consistency in the refereeing of scrums.

The 1991 Rugby World Cup-winning coach, speaking exclusively to ESPN following the completion of the November Test series, said teams would have to be adaptable and prepare for a variety of different law interpretations.

"I don't think there's any chance of having a consistent, accurate interpretation across the board," Dwyer told ESPN. "I think it's going to vary from referee to referee and game to game, and I think it's up to each scrum to be capable of adjusting their technique both in an attacking sense and a defensive sense. So I think it's up to us as individuals to sort that out."

Dwyer also discussed England's 26-17 defeat of Australia at Twickenham, a match the home side secured on the back of a dominant set-piece - albeit with the help of some questionable scrum tactics.

Michael Cheika said after the match that his side would need to re-evaluate their set-piece approach, and Dwyer said the Wallabies need to put more time and training into their scrum ahead of next year's global showpiece.

Read Bob Dwyer's analysis of the England and Australia set-piece, and the Wallabies' progress under Cheika, on ESPNscrum from Wednesday, December 10.