Shaun Edwards boosts Wales by signing new deal until 2019 World Cup

• Defence coach will be at third successive World Cup under Warren Gatland• Jamie Roberts injured in Cambridge University’s defeat in Varsity matchWales are struggling to keep some of their leading players in the country but their coaching team is set to be in place for a third successive World Cup after Shaun Edwards, who had been linked with a move back to his native England, signed a new four-year contract.Edwards, Wales’s defence coach since the start of 2008, was a free agent after 30 November. Although the Welsh Rugby Union was in talks with him there were fears England’s new head coach,…