Miller, who was raised in Bretton, Peterborough, made his debut in a match at Mickleover Sports. It finished 2-2 with Grantham conceding twice in the final three minutes. Grantham are six points adrift at the foot of the table.
Tommy Rowe scored from 20 yards for Doncaster Rovers, but the lowly League One side were beaten 3-2 at home by League Two Mansfield.
Ethan Hamilton scored twice as Accrington Stanley thrashed lowly Fleetwood Town 5-1 in a League One match. The midfielder, who left Posh in the summer, now has six goals for the season.
Ex-Posh striker Ivan Toney missed Brentford’s 2-2 Premier League draw at Leeds United today after a positive Covid test.