Ben Youngs insists England must play fast but not loose against Fiji

• Scrum-half warns hosts of Fiji’s quality before Friday’s World Cup opener• Youngs says England will be happy to be pragmatic and rely on their set pieceAll the big southern hemisphere guests have now arrived but the visitors causing England most pre-World Cup concern are Fiji. Ranked ninth in the world there is an air of quiet optimism at the latter’s training headquarters in Sunbury regardless of their Pool A schedule.As Stuart Lancaster prepares to name his starting XV for Friday night’s tournament opener, this is no time for English complacency. The line-up selected by Lancaster will, acc…