Bury bounced back from two disappointing home defeats with a hard-earned victory on Saturday.
The Old Boys took the lead on 55 minutes with Dan Matkin picking out Lloyd to finish in the bottom corner.
Bury doubled the lead within a minute when Andy Dakin finished from a seemingly impossible angle, curling his shot over the keeper and into the net.
Fitton chipped in a third goal before the hosts pulled a one back late on.
Bury GSOB failed to make their chances pay against the reigning Premier Division champions in midweek.
An awkward punch from keeper Tom Massey gave the visitors against the run of play and Prestwich doubled their lead before Adam Hudson scored a late consolation.
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