By Mark Plummer

PETERBOROUGH U 3Szmodics 33, 48, Clarke-Harris 67 (pen)NORTHAMPTON TN 1Harris 43 (pen)Rating: ★★★★★ Ref: Lee Swabey 8/10STAR MANDAN BUTLER PeterboroughOFF THE MARK: Sammie Szmodics scores his and Posh’s first goalPICTURE: AlamyICING THE CAKE: Jonson Clarke-Harris celebrates his spot-kickDARREN Ferguson toasted derby glory as Peterborough “ticked off” another success in their promotion quest.Posh opened up an eightpoint gap on third-placed Sunderland – thanks to Sammie Szmodics’ double a...