In a tight first half McVicar had already seen Club goalkeeper Josh Mimms save in a one-on-one situation before the visitors took the lead when Warren Bureell converted Connor Higginson's free kick on the half hour.
Six minutes later it was all square as MacVicar's powerful run led to Reuben Wiggins-Thomas laying the ball into the path of Terry Hawkridge, who made no mistake from 12 yards.
The Millers piled on the pressure in the second half and took the lead on 67 minutes when MacVicar was on hand to head into an empty net from six yards after Josh Thornton's header had come back off the post.
And the victory and a guaranteed play-off spot was sealed on 75 minutes when MacVicar was once again in the right place at the right time to head home a Wiggins-Thomas knock back after another run and cross by Hawkridge.
With Ilkeston drawing and Grantham winning, the Gingerbreads have been confirmed as league champions and we congratulate them on their achievement.
Les McJannet's men find themselves in third place in the table, level on points with the Robins and just one goal shy of them on goal difference.
The task now for the Millers is to try and finish second to secure home advantage throughout the play-offs.
Carlton are next in action on Monday when they travel to Rainworth Miners Welfare (3.00pm).
A full report from today's game will appear over the weekend.