Witney 2nd should be safe from the drop, despite losing 3-1 at home to Wycombe in Middlesex, Berks, Bucks & Oxon League Division 4.
Tom Yallop was on target for Witney, who face basement boys Marlow 3rd in their final fixture this weekend where a draw will guarantee safety.
But Witney 3rd, who completed their fixtures last weekend, go down from Division 5.
Joe Taylor scored a double as Witney 4th fought back to beat Bracknell Terriers 4-1.
Andy Taylor and Alastair Anderson sealed their tally after Bracknell had taken an early lead.