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Welling saw their lead at the top of Blue Square Bet South cut to eight points after a 2-1 defeat at second-placed Salisbury on Saturday.
Errors led to both Salisbury goals before Joe Healy, pictured, set up an interesting finish with a late penalty.
A mistake by goalkeeper Sam Mott gifted Jamie White the opener after 20 minutes and he doubled Salisbury’s lead on 70.
The hosts then went down to 10 men when they had Will Puddy sent off for the challenge leading to Healy’s 86th-minute penalty.
Welling pushed for an equaliser, but were snuffed out by a Salisbury side who will close to within five points of the leaders if they win their game in hand.