Bicester & North Oxford 2nd beat Wallingford in the showdown to decide the Division 5 title.
Bicester never looked back after racing to 139-0, Krishan Talsania going on to hit 107 in the home side's 249-5.
Ian Bryan took 5-40 and Richard Simpson 4-19 as Wallingford were all out for 188.
Bicester & NO 25pts, Wallingford 5
Wallingford's woes worsened as Chearsley beat Bledlow Ridge 2nd to deny them the second promotion place.
Chearsley looked down and out after falling for 135, but Ben Lazaruk (6-31) bowled Ridge out for 118 with time running out in the 56th over.
Chearsley 25, Bledlow Ridge 6
Abingdon Vale 2nd are down having failed to win a single match.
Chris Butcher (45) led the way in their 221 against Leighton Buzzard 2nd, who settled for a draw on 202-5.
L Buzzard 2nd 12, Abingdon 2nd 12
Oxford & Bletchingdon Nondescripts 2nd escaped the drop by beating Banbury 3rd in style.
George Frankland (5-22) and Andy Haynes (4-28) bowled out Banbury for only 143, Mark Taylor (60) and Haynes (36no) seeing Nondies to 148-4.
Banbury 3rd 6, Ox & Bletch 2nd 25
Challow & Childrey 2nd are safe after a draw at home to Great & Little Tew 2nd, Owen Dimbylow making 104 not out in their 243-5.
Tew replied with 201-8.
Challow 2nd 15, Gt & Lit Tew 2nd 8
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