Warren Gatland trains his sights on England after Scotland rout

• Wales’ Six Nations odds halved after rampant opening-day win• ‘It is a mouth-watering fixture. I hope people sit up and take notice’It has rarely paid to dismiss a team coached by Warren Gatland. Ten years after his side confounded expectation by winning at Twickenham for the first time in 20 years in his first match as head coach, the manner of Wales’s victory against a Scotland side that for once went into a Six Nations campaign armed with expectation rather than hope makes the excursion across the Severn Bridge this Saturday all the more intriguing.England, whose last defeat at Twickenham…