Bargoed, promoted to the Principality Premiership for next season, started massive favourites, though both clubs had claimed a Championship win at each other’s ground this season.
It was Beddau who had the better backs with more ideas and a hard-working pack, even though skipper Glen Slater was missing with injury.
They tackled their hearts out and even had to play a second half of 52 minutes that went on and on with Bargoed pressing all the while, but Beddau’s defence was heroic to say the least.
Sam Withers was splendid at full back and James Davies was a fine left wing, while Christian Francis and Lloyd Evans stood out in the forwards.
Bargoed never really put it together though their veteran lock Nicky Coughlin gave his best and James Pizey at scrum half was always dangerous, but Beddau, the highest-placed club in Wales without Premiership criteria, just about deserved the win.
Beddau took a 10-0 lead at half-time having gained a ninth-minute try in great style when Hywel Chatham kicked cleverly, Davies caught and threw infield for Withers to race clear and convert.
A Withers penalty followed after 38 minutes and Bargoed had never really got into it.
After the break Bargoed came on strong and after 45 minutes Pizey found a hole and was over before Beddau could blink. Matthew Hurley converted and it was game on.
But, first Pizey, then skipper Leigh Meades who were yellow-carded by referee Jason Bessant, but Withers twice missed with tricky penalty shots.
But Beddau were not finished and their drove over with loose-head Ben Stephens getting the touchdown at 15-7.
Bargoed, now back to full strength, came forward and seemed sure to score, but it was not until 79 minutes had gone that their pack earned a penalty try, converted at the second effort by replacement Phil Price.
With one point in it, Bargoed camped on the Beddau line and for 12 nail-biting minutes they looked sure to score, but suddenly Beddau had possession and kicked it dead. Once more the Mid District had come up with a shock at the final stage and it was an absolute thriller.
Bargoed, winners for the three previous seasons, will not be eligible to compete in the Cup next season but they will be well satisfied with their new Premiership status.
