MATCH REPORT: Hughes haunts his old club in reserve team win
Hughes opened the scoring on 11 minutes from a Lewis Freestone cross, but the visitors to the ABAX Stadium equalised within two minutes through Momodou Tourey.
Paul Taylor shot a strong Posh side back in front on 26 minutes following another cross from impressive left-back Freestone and early in the second-half Hughes made it 3-1 from a corner.
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Hide AdLewis Collins pulled a goal back for Newport before Posh substitute Morgan Penfold saw his penalty saved after another replacement Andrea Borg had been upended.
A Taylor cross led to an own goal from Jay Williams before Borg headed the final goal from close range two minutes from time.
Posh fielded a trialist goalkeeper in each half and also a trialist midfielder who created the final goal.
Posh: Trialist (sub Tralist), Hart, Freestone, Hughes, Goode, Inman (sub Nabi), Chettle, Forrester (sub Trialist), Nicholson (sub Borg), Nichols (sub Penfold), Taylor.