Redbourn snatched a memorable promotion from Division of the Herts Cricket League with a famous last-day win.
They were up away to Reed and needed 11 points to win the title, points they were able to get.
However, Redbourn took the victory by five wickets and then had to wait for news of Luton Town & Indians, who were at home to Hitchin.
Victory for the Bedfordshire side would have sent them up and with five overs left to play, they were on 165-7, 17 runs from the magic mark.
However, they lost two wickets in the next over, gaining just one run, and in the over after that, the final wicket fell to start the Redbourn party.
Redbourn had used eight bowlers to get Reed out for 190, Adam Pritchard the best of them with 3-25, just ahead of Jason Bryceland's 3-26.
Harry Cobb then starred with the bat, scoring 82 in 72 balls to help them to victory with five overs to spare.
One of the sides they will replace in the Championship are St Albans.
Their relegation had already been confirmed but they could not finish the season with a win, losing by 29 runs to Hemel Hempstead at Clarence Park.
Daniel Rosson took 3-51 while there was 64 for skipper Joe Regan with the bat.
Premier Division champions Harpenden crowned a wonderful season with perhaps their best performance of the lot.
Potters Bar had seen their hopes of the title vanish one week earlier and it was new champions Harpenden who delivered the exclamation point to the season with a crushing 143-run success at the Common.
The hosts smashed 290-9 in their 50 overs, 110 of them from Cole Briggs with seven fours and three sixes.
He was aided by 78 in 58 deliveries from Harry Seagrave, 13 of them going for four while two cleared the rope.
Briggs would be a thorn in the Potters Bar side during their reply too, taking four catches and two stumpings.
It was part of an attack that almost pulled off an even grader victory as they had the score at 85-9 at one point.
Only a defiant last-wicket stand from Luke Chapman (26*) and Jigar Mehta (35) raised the score up.
Andrew Neal took 4-23 in his 10 overs to lead the Harpenden bowling with two wickets each for Tom Beasley and Usman Malik.
It means they win the league by a whopping 56 points with 14 wins from 18 and just two defeats.
Radlett's seventh defeat of the year means they end the year in fifth.
They went down by six wickets at home to Bishop's Stortford, a victory that had massive consequences for Shenley Village.
The village side won their game at West Herts by four wickets but remain two points behind Stortford in the table, and now face a play-off against Welwyn Garden City to keep their top flight status.
Mo Rizvi (66) and Morgan Stanley (42) produced a match-winning stand of 106 for the third wicket for Shenley.
Jayden Broodryk scored 78 for Radlett.
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