Tiddington 2nd are favourites to join Division 6 champions Didcot in Division 5 next season after they thrashed Oxford 4th by 148 runs.
Nick Edmondson (119no) and Ian Pykett 44 added 113 for the second wicket before Tiddington declared on 256-7.
Neil Smith then took 6-21 from 18 overs as Oxford crashed to 108 all out.
Tiddington 25pts, Oxford 4th 4
Horspath 2nd walloped Wolverton Town 2nd by eight wickets to give themselves a chance of catching Tiddington.
Town were soon all out for 81 thanks to Andy Cummings (4-22) and Arfan Younus (4-27).
Stephen Green (31no) then helped Horspath to 84-2.
Horspath 2nd 25, Wolverton Tn 2nd 2
Matt Jones took 6-39 as Didcot dismissed Long Marston for 108 and relegated them.
Simon Pritchard (48) was the mainstay of the home side's 109-4, which lasted 27.5 overs.
Didcot 25, Long Marston 2nd 5
Brackley remain a long shot for promotion beating Sandford St Martin 2nd with ease.
Dave Barnes (58) provided the backbone to Brackley's 163-8, then James Timmis took 6-47 as Sandford slumped to 118 all out.
Brackley 25, Sandford St Mart 2nd 4
Ian McStay took 6-18 as Thame Town 2nd blew away Bourton Vale 2nd for only 79.
Nick Fuller also bowled well to finish with figures of 3-28.
Ryan Murray's 68 not out then took Thame to 83-1 inside 20 overs.
Thame Town 2nd 25, Bourton V 2nd 1
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