Chris Boyd’s influence could extend beyond shaking up the Saints

Fresh approach of Northampton’s new coach may inspire others to speed up the pace of change in the PremiershipThere have been some eye-catching additions to the Premiership this summer, even if the clubs have generally avoided splurging as they grapple with mounting debts.Bristol have recruited the league’s first £1m-a-year player, Charles Piutau, and invested in what is left in the legs of the Wallabies flanker George Smith. Gloucester have fortified themselves with a clutch of signings from the Golden Lions, the former home of their coach, Johan Ackermann; Wasps have replaced Danny Cipriani …