Oundle made no mistake in their bid to close out the NCL Division One title race.
Leading rivals Desborough by 10 points at the start of the day, the favourites for promotion completed the final push in style.
They bowled out Wellingborough Indians for 89 at Sywell Road and then knocked off the required runs without loss.
At the bottom end, Old Wellingburians pulled off the great escape as their 30-point success over Irthlingborough secured them safety.
Isham go down from the first division after being heavily beaten by runners-up Desborough.
OWs had won just once all season before last weekend but completed back-to-back victories in the run-in to stay up.
Isham go down having lost 14 of their last 15 games.
In the Premier Division, Peterborough rounded off their title-winning campaign with a convincing nine-wicket win over Wellingborough Town.
Northampton Saints finish second having beaten the NCCC Academy. It was the Academy’s final game having stated their intention to withdraw from the league.
Finedon Dolben are third after losing their last match by 56 runs to Old Northamptonians.