By Matthew Cooper England rugby star Billy Vunipola has been handed a formal warning by the Rugby Football Union (RFU) following his drunken arrest in Majorca earlier this month. Vunipola was tasered twice by police and detained for assaulting an officer and resisting arrest, with the 31-year-old receiving a four-month suspended prison sentence and a €240 (£205) fine after agreeing a plea deal with prosecutors. However, he has escaped a ban after the RFU announced they had issued Vunipola with a formal warning over the incident. It comes after Vunipola’s club side Saracens also issued him a wa…