North Petherton went into the game optimistic they could prevent Wyvern completing a double of victories.
But Wyvern had different ideas and were 5-0 ahead after two minutes.
Wyvern tore into their opponents and camped themselves in North Petherton's line for five minutes.
North Petherton were resolute in defence and played their best rugby when going through phases.
The visitors wasted opportunities through sloppy handling or lack of support and scored their points via a first half penalty
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