Rugby World Cup 2011: What difference can a ball make?

BBC Sport's Francis Collings looks at the complaints made about the Gilbert ball at the Rugby World Cup.

England's kicking coach Dave Alred and fitness specialist Paul Stridgeon were found to have switched the ball Jonny Wilkinson was due to kick with during England's 67-3 win over Romania without asking the permission of referee Romain Poite.

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