Peterborough manager Darren Ferguson feels his side are hitting top form again as the race for promotion in Sky Bet League One intensifies after they hammered rivals Northampton 5-1 in the Nene derby.

This was the Posh’s third league win in a row which moved them to within five points of second-placed Bolton, with their current run coming after four straight defeats threatened to derail their push.

Ferguson said: “We had a blip and they’re a young group – if we had gone through the season without a blip, I would have been surprised.

“When you go through bad times in the season, you have to make sure you’re strong enough to go back and improve when you’ve made mistakes, failures and losses because they’re the ones that define the season.

“We had to make sure we got over that and there’s no question the Blackpool game (in the semi-finals of the Bristol Street Motors Trophy) to get to Wembley has really been a huge shift in momentum.

“But then to win three league games, two of them derbies, is a credit to my players.

“It was all-round a very good performance.

“I thought each member of the team and the subs, it was all-round a very confident performance, and it was a very good result.”

Northampton led after nine minutes when Marc Leonard’s cross was headed in by Jon Guthrie, but Peterborough never looked back after Ephron Mason-Clarks’ 25th-minute equaliser from Jaden Katongo’s low ball across.

Kwame Poku’s whipped finish completed the turnaround three minutes later before Joel Randall poked in a third for the Posh after Poku’s mishit ran off Jack Sowerby.

Hector Kyprianou’s header just before the hour effectively made the game safe, with Josh Knight completing the rout five minutes later after Randall’s corner wasn’t cleared.

Northampton boss Jon Brady said: “We’ve got to hold our hands up and that’s a tough night that’s tough to take against your local rivals, but hats off to them, I thought they were excellent.

“I thought the goals we gave away were very soft tonight.

“We started off, we got the goal then conceded two pretty quick goals and it wasn’t good enough thereafter.

“I’m not going to paper over any cracks and we’ve got to hold our hands up, we’ve got to defend better and be more solid in those moments – defensively we weren’t good enough.

“We’ve got to defend those goals so much better and we’ve got to make sure we get it right for Saturday (at Cambridge) and bounce back.

“We were very good earlier on in the season when we beat them at home 1-0, and today we had a bad night and we’ve got to make sure we get it right on Saturday.”