Owen Farrell admitted the tackle that resulted in his suspension for Saturday’s World Cup opener against Argentina was a mistake. England’s captain was “gutted” to be unavailable for the pivotal Marseille showdown after his dangerous hit on Wales’ Taine Basham last month resulted in a four-match suspension that ends after the Pool D clash with Japan. Farrell initially had his red card downgraded to a yellow by a disciplinary hearing, only for World Rugby to appeal the decision, which was upheld.