England’s Joe Marler faces RFU sanction for tweet about former Australia coach

• Marler used Twitter to criticise Bob Dwyer with abusive epithet• Dwyer accused Dan Cole of illegal scrummaging in England’s Brisbane winThe England prop Joe Marler has risked sanction from the Rugby Football Union after using social media to direct an obscene remark at the former Australia coach Bob Dwyer.Marler used Twitter to call Dwyer a wanker in response to his claim that Dan Cole scrummaged illegally in the first Test against the Wallabies. The tweet was quickly deleted but the RFU has strict guidelines on the use of social media and Marler, a member of England’s elite player squad, no…