Saracens’ Brad Barritt must turn up intensity faster in Wasps semi-final

• Saracens defeat Northampton 29-20 after a sluggish start • Barritt’s side face Wasps in European Champions Cup last fourAfter the pyrotechnics in Coventry, here was a curious quarter-final, notable for the relentlessness of a champion team whose form had deserted them. Saracens left it until the 68th minute to overhaul Northampton, when a former Saints old boy, Chris Ashton, swooped to score their first try of the match. Their second, by Chris Wyles, followed a few minutes later.Good teams win when they are playing badly, so they say; the really good ones do so comfortably. In the end, this …