​Northamptonshire all-rounder Calvin Harrison has signed a contract extension that will see him remain at the county until 2029.The 28-year-old, who is in his first full season at Northants, has scored 477 runs batting at three in this season’s County Championship Division Two.AdvertisementAdvertisementAdvertisementHarrison has also taken 18 wickets in the Steelbacks’ T20 Blast campaign, with the Wantage Road side set to face Gloucestershire in Wednesday’s quarter-finals.”I’m really happy to be extending my time here at Northamptonshire.” Harrison said. “It’s a brilliant dressing room with a top-class spirit.”Northants’ head coach Darren Lehmann said: “He [Harrison] is a leader in the group and a player that continues to strive for excellence on and off the field.”It’s another important signing for us moving forward as we develop our squad for the future.”