Scarlets look a shadow of Llanelli while Northampton go marching on

• Scarlets 10-22 Northampton• Bonus point win sees Saints into Champions Cup quarter-finalIt was comprehensive on the night and, although the weather was foul, it turned out to be the start of a fine weekend for Northampton. Thanks to Exeter’s defeat of the Ospreys and Bordeaux-Begles’ victory over Clermont, Northampton squeeze through to the last eight. The ramifications for the Welsh regions – for the entire Pro12, in fact – are contrastingly dire. Only French and English clubs remain in the Champions Cup.There was a time, and not so very long ago, when Llanelli – affectionately but not yet …