Tuilagi unaware of gumshield rule

England centre Manu Tuilagi says he did not know he was not allowed to wear a sponsored gumshield, after he was fined £4,800 by Rugby World Cup officials for wearing one during the win over Georgia.

Tuilagi's brother, Alesana, was fined last week for the same offence but the England player tells BBC Sport's Dan Roan the offence occurred before his brother's.