OXFORD Downs 2nd were rolled over for just 113 as opponents Long Marston clinched the Division 4 title.
Marston chose to bat and made 217-7 thanks to Mike Lyons (58), Harry Bowles 41 and Martin Wright (53no).
Lee Beesley then took 5-16 to kick-start the celebrations.
Oxford Downs 2nd 11pts, Long Marston 30
Chearsley can also plan for life in Division 3 after they thrashed Princes Risborough - who have applied to join the Thames Valley League in 2008 - by eight wickets.
Nick Thomas (45) was the only Risborough batsman in form as they succumbed for 137.
Wicket-keeper James Veness took six catches and then hit 57 not out in an unbroken 110-run partnership with Russell Haynes, who was undefeated on the same score.
Chearsley 30, Princes Risborough 7
Brackley finished well adrift at the bottom after being hammered by Buckingham Town 2nd.
Vish Valambhia took 4-16 and Paul Sly 4-26 as Town bowled out their visitors for 109.
The home side then needed only 20.2 overs and four batsmen to secure the win.
Buckingham 2nd 30, Brackley 6
Challow & Childrey 2nd made all the running in their match with Bicester & North Oxford 2nd, but had to settle for a draw.
Paul Jeacock took 5-46 in Challow's 206-8, while Tim Beuzeval produced even better figures (5-35) as Bicester struggled to 101-8.
Bicester & NO 2nd 5, Challow 2nd 17
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