Mullets win but EP and Wick lose
Jason Wimbleton gave Mullets an early lead, before an own goal gave them all three points nine minutes after half-time.
Wick suffered a surprise 3-0 defeat to relegation-threatened Worthing United and dropped to fifth.
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Hide AdArundel are now just three points behind third-placed East Preston, with two games in hand, after EP lost 3-1 at Three Bridges.
In Division 2, Rustington stayed second after Brett Neal's 79th-minute goal gave them a 1-0 win over Midhurst.
In the same division, Littlehampton lost 2-0 at fourth-placed Lingfield.