A goal from Adam Lenz kept alive Inter Borehamwood's title hopes as they edged past Shirley Park in Division Four.
North West Neasden C boosted their hopes of a top four finish by coming from 4-1 down to draw 5-5 against Los Blancos.
Louis Taylor (2), Adam Levene, Ross Kester and Joel Kanutin registered for Neasden. Los Blancos' goals came through Adam Hersh (2), Doron Weinstein, Adam Waters and Ariel Weinstein.
Strikes from David Levy and Daniel Lipman helped newly-crowned Division Three champions Glenthorne United A overcome Catford & Bromley Maccabi 2-0.
Thornes joint player-manager Dan Lipman said: "This was a great end to the season. Our home form has been second to none this year. We've won every game at Old Chigs and only conceded six goals all season."
Co-manager David Blitz said: "We are looking forward to cheering on the B's in a fortnight and celebrating a double promotion and championship season.
Norstar B maintained their grip on third place following a 2-2 draw against Faithfold C. Josh Kleiman and Jonathan Peters struck for Norstar. Faithfold's goals came through Ben Simons and Simon Beresford.
Strikes from Dan Roth and Gav Rhodes ensured that Real Life finished the season without a victory as Barry Goldstein Cup runners-up UJIA consolidated sixth position.