Iain Clark and Colin Day overcame a four-shot deficit to triumph at the PGA Super 60's following a four-way play-off at Lincolnshire's Forest Pines club.
The Hagley pair's opening round 71 left them four shots adrift of overnight leaders Ian Richardson and Peter Beeke, but a superb second-round 67 handed them the clubhouse lead with Wednesday's low-scoring pairs still out on the course.
College Pines duo David Snell and Jack Timms (68), David Butler and Paul Butler (69) and Richardson (Burghley Park) and Beeke (71) could all only match their total of 138 over the 36 holes, ensuring a tense sudden death climax to the tournament.
Former champion Snell, now playing alone, was eliminated when he bogeyed the 18th hole before Clark and Day, making their first appearance at the Scunthorpe course, wrapped up the win at the second time of asking when Clark sunk a less than straightforward putt just as the light began to fade.
Clark, whose son Cameron holds the course record at Forest Pines with a nine under par score, said: "We thought we had a chance because we played quite well on Wednesday but nothing went for us.
"We had a nice little run early on this morning, the first four holes were steady and then we made a couple of birdies and Colin made an eagle at the ninth - that really seemed to get us going.
"But I missed a couple of short putts coming in which made it a bit more nervy. There were two or three on eight under after 27 holes so we thought someone would beat par on the back nine but obviously no one did."
"The first play-off hole wasn't great, we both had a couple of mis-hits but my partner hit two lovely shots on the 18th. He had that putt earlier to put us on nine under but he just stroked it in like a maestro as if he was used to it.
"The tournament itself was great. I met so many old pals, it was smashing.
We had a great day, it all worked out wonderful in the end.
"I have tried 42 years to win a national PGA event and I have finally done it."
Day, 62, admitted he was a relieved man to sink the decisive putt. "I was so nervous," he said. "I have never been that nervous on the golf course."
A 70 from Bolton's Bob Longworth and Gerry Delaney was enough to earn fifth place, while last year's runners-up Gordon Gray and Marshall Douglas fired a 71 but had to make do with a share of sixth this time around.
They were joined by one of Wednesday's frontrunners, Graham Burroughs and Peter Keeble (Boyce Hill), as well as Bobby Browne and Brian Hall (Laytown and Bettystown) and Malcolm Cole (retired) and John Wrigley.
Reigning champions Frank Hill and Brian Underwood (Thorpeness) were forced to settle for 10th after their 70 gave them five under par for the tournament.