Johnson strikes at the double
Johnson opened the scoring after only eight minutes with a stunning 20-yard drive which ripped into the top corner of the net.
Westfield doubled their lead midway through the first half when a free-kick was met by Mark Drinkwater whose header across goal was finished off by Darrol Parris.
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Hide AdMile Oak hauled themselves back into the game by halving deficit on the stroke of half time thanks to a close range header from Darren Morris.
Johnson had the final word though when eight minutes from time he claimed his second goal of the afternoon with another well-struck drive that gave the keeper no chance.