Joe Marler handed formal warning for obscene comment about Bob Dwyer

• England prop insulted former Australia coach on Twitter• Marler picked up two bans during season and sought helpThe England prop Joe Marler has been handed a formal warning following an obscene comment he made on social media about the former Australia coach Bob Dwyer.Marler used Twitter to call Dwyer a wanker in response to his claim that Dan Cole scrummaged illegally during the first Test against the Wallabies. The tweet was quickly deleted but the Rugby Football Union has strict guidelines on the use of social media and has sanctioned Marler, a member of England’s elite player squad. Rela…