Leaders Bicester Town were held to a goalless draw in their Division 1 East top-of-the-table battle at Hounslow Borough.
New Bicester signing Julian McCalmon thwarted Michael Meaker in the early exchanges, before Vinnie Byfield blocked an effort from the same player.
Bicester's best chance came midway through the second half when Greg Shawyer's header from Adam Hamp's cross was brilliantly saved by home keeper Ben Miles.
Headington and Letcombe shared the points in a goalless draw in Division 1 West.
Neil Drewett, Matty Crook and Jason Maciak missed good chances for second-placed Headington in the first half.
Hook Norton were given a lesson in finishing as they lost 2-0 to Cheltenham Saracens.
With the wind behind them, Hooky dominated the first half, but Saracens opened the scoring on the half-hour when Chris Palmer fired home a free-kick.
Substitute Adam Staines headed Saracens' second goal with ten minutes left.
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