Danny Horton put the Greens 1-0 up at their United Counties League Premier Division North rivals, drilling home from the edge of the box with 12 minutes gone.
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But the hosts drew level jus before half time as Jake Payling found the net for the Parishioners.


But Tom Ward's side had the dinal say as Smith met Mitch Griffiths' free kick to nod home with two minutes to go.
Sleaford sit 12th in the table and host Newark on Saturday (KO 3pm).