Boffelli the hero as Argentina edge England
Edinburgh winger Boffelli scored 25 points in what was a dress rehearsal for next year's Rugby World Cup opener between the teams as Argentina ended a 10-match losing streak against England.
The hosts scored the only try of the first half, through powerhouse winger Joe Cokanasiga but turned round just 16-12 ahead after Boffelli landed all four of his penalty-goal attempts.
Argentina, however, hit back with two tries early in the second half from Boffelli and Gloucester fly-half Santiago Carreras to lead 24-16.
But England replacement scrum-half Jack van Poortvliet, on the field for barely 30 seconds, then went over for a converted try before another Farrell penalty nudged the home side ahead at 26-24.
Boffelli's long-range penalty then made it 27-26 to the Pumas before the Pumas' goalkicker edged the visitors ahead again, with Argentina winning beating England at Twickenham for only the second time since a 25-18 success in 2006.