Posh are promoted to the Championship.
Chairman Darragh MacAnthony and manager Darren Ferguson led the celebrations on the pitch as Posh beat Colchester while sole rivals MK Dons were losing at home to Walsall.
Charlie Lee's stunning 40th minute strike sealed a win which should have been gained by a far bigger margin.
Posh were superb on the day as Colchester relied on 'keeper Dean Gerken to keep them in the match.
He made superb stops from Craig Mackail-Smith (twice), Chris Whelpdale and Aaron Mclean.
» Read the full match reportPosh promoted: full story, reaction and reports in words and pictures »----------------
Teams:
Posh: Lewis, Martin, Lee, Morgan, Zakuani, Coutts, Keates, Whelpdale, Boyd, Mclean, Mackail-Smith.
Subs: McKeown, Westwood, Frecklington, Green, Batt.
Colchester: Gerken, White, Lockwood, Coyne, Baldwin, Izzet, Yeates, Hackney, Tierney, Platt, Vincent.
Subs: Cousins, Heath, Wordsworth, Corcoran.Colchester's best effort was saved until the 94th minute when Mark Yeates flashed a 25 yard shot over the crossbar.
Leave your message of congratulations to the team as a comment below or
email Alan.Swann @peterboroughtoday.co.uk.
In Monday's Evening Telegraph 8-page promotion special with the full story, photos and reaction.
DON'T Forget the Evening Telegraph Posh player of the season Chose the winner and you could win a signed Posh shirt AND present the award on the London Road pitch next Saturday (2 May) before the Swindon game » .
Match preview, 24 April:Colchester boss Paul Lambert: We'll rain on Posh's parade.
Keates is seeking a Walsall favour.
Home is far from sweet for the U's.
Ferguson: Don't expect a cakewalk, 23 April.
