Wallingford went top of the table thanks to a comprehensive 31-6 home victory over previous leaders Slough.
Slough went 6-0 up with two penalties, but within five minutes Wallingford No 8 Simon Henderson had powered over in the corner.
Great handling enabled winger Nick Risk to cross for try No 2 and the hosts led 10-3 at the break.
Early in the second half, hooker Tom Hill pounced on a fly hack and scored, Olli Henderson converting.
Centre Don Jenkins raced in from 40 metres for Wallingford's fourth try and added a second on 65 minutes. Henderson converted both.
A stirring second-half display saw Bicester win 28-18 at Phoenix after trailing 10-8 at the break.
Flanker Graham Hulse drove over to give Phoenix the lead and No 8 Nigel Coltman converted.
Bicester centre Chad Ward then made an immediate impact on his return with a try.
Coltman made it 10-5 with a penalty before Ward matched his feat.
A textbook lineout move enabled No 8 Martin Linstrom to cross for a try that Ward converted.
Veteran loose-head Tony Shaw rumbled over in the corner to stretch Bicester's lead.
Ward and Linstrom were both sin-binned, but Coltman and James Barrett shared a penalty apiece.
A try from scrum half Dave Harris gave Phoenix hope, but Bicester winger James Holton wrapped up victory with a late score.
Gosford All Blacks took their home derby with Abingdon 23-14.
Tim Sutton, deputising at fly half after his brother Charlie was struck by lightning, gave Gosford the lead with a tenth-minute penalty.
Abingdon's Ian Thompson replied to make it 3-3 before Gosford woke up and Marc Grant eventually crossed in the corner.
Home skipper Kris Wadley was driven over for try No 2, but two more Thompson penalties made it 13-9.
Gosford resumed with only 14 players due to a lack of replacements, but James Barrett still shimmied over, Sutton converting.
Abingdon winger Vince Barnes made it 18-14 with the try of the game before Gosford prop Will Machin completed the scoring.
Duncan Lynchsmith amassed 20 points in Oxford's 30-15 victory at Broadmoor Staff.
Lynchsmith bagged one try, three conversions and three penalties.
Tom Johnson set up Oxford's first try for Henry Swales, while Lynchsmith's solo effort made it 14-5 at the break.
Oxford's best try saw Alistair Gibb set up Johnson after Lynchsmith's diagonal kick.
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