Wales’s rising sons set the northern hemisphere benchmark for Japan | Robert Kitson

England may have lost the plot at Twickenham but grand slam winners could write another happy endingHow quickly modern rugby’s wheel of fortune spins. A few weeks ago Ireland were an irresistible force, enjoying such critical acclaim that back-to-back Six Nations grand slams seemed possible. Early last month it was England who were basking in the light, to borrow Billy Bragg’s classic line, of the 15 fame-filled minutes of the fanzine writer. And now? The 2019 Six Nations music is stopping with Wales gloriously on top. Related: No doubting that Warren Gatland’s Wales deserve their grand slam |…