Kettering got their play-off bid back up and running in Midlands One East with this comprehensive victory.
In the end, Blues had too much pace for Peterborough, although they never gave up and their spirited efforts were rewarded with a try of their own at the end of the game.
Blues had already created and missed some good chances before Joe Daniel opened the scoring with a fifth-minute penalty.
Peterborough then broke from behind their own line and swept 70 metres upfield and looked like taking the lead.
Matt Nield had other ideas and, after turning the ball over, broke out of defence to feed Paul Sumner who raced in from 60 metres for the opening try which Daniel converted.
Peterborough hit back with a penalty, but Blues continued to dominate and Joe Marsden went over for their second try on 35 minutes.
Daniel missed that conversion but was on target with one just before half-time after Joe Newman smashed his way through several would-be tacklers to score Blues’ third try and give them a 22-3 lead at half-time.
The second half was more of a stalemate with both sides struggling to maintain continuity.
Blues eventually put together a good handling move that ended in an unconverted try for Chris Chapman.
Blues continued to pressurise the Peterborough line after that and got their fifth try with 10 minutes left as Marsden went in for this second of the game.
Peterborough kept going and got a try of their own late on, much to the disappointment of the home defenders.
But the victory was not in doubt and after the problems of recent weeks, this was a much-needed boost for the Blues, not least because they found their scoring touch again after only managing two tries in their previous three matches.
Raj man of the match: Joe Marsden.
The seconds also met their Peterborough counterparts and won 17-6 with tries from Ashley Corden (2) and Damon Adcock, and a conversion from Bruce Keir.
Raj man of the match: Ashley Corden.
The thirds drew 25-25 with Dunstablians 2nd, while the Vets won 24-10 at St Neots with tries from Matt Foster, Mark Colson and Graham Wilson (2) and two conversions from Andy Jackson.
Ryan Conyard’s late penalty earned the Colts an 18-16 win at S&L. Conyard landed two penalties and a conversion in the game while Joe Briton and Jacob Grinley got Blues’ tries.
Global Group man of the match: Ryan Conyard.