Billy Vunipola back in contention for England Six Nations match with Scotland

• No8 has been sidelined with a knee injury since November• Saracens confirm Vunipola in full training before Newcastle matchEngland’s defence of their Six Nations title has been handed a major boost with Billy Vunipola in contention to make his Saracens comeback on Sunday, meaning he could potentially face Scotland next weekend.Vunipola, who has been sidelined with a knee injury since November, would be in the frame for the Calcutta Cup match if he comes through Saracens’ trip to Newcastle unscathed. Related: Rule book will be England captain Dylan Hartley’s new bible after Italy Continue re…