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Swarbrick appeared to wave away West Brom's appeals for the foul which was committed just outside the area, however the linesman flagged for a foul and for Williams to be dismissed.
At the time of the incident United were trailing 1-0, and the card effectively ended any hopes of getting back into the match.
Iron boss Nigel Adkins said at the time: "I could clearly see the referee signal the players had collided and then the linesman, with his new Christmas present, put his flag up and then the referee came over.
"To be a red card was really damaging"
It is a boost for United, as Kelly Youga has returned to Charlton leaving United with less defenders than usual for their second trip to Deepdale in Lancashire within two weeks.