Danny Kedwell converted two penalties for the Gills in quick succession early on, with Tom Flanagan being sent off for the foul that led to the second, and a Patrick Bamford brace then had the visitors level by half-time, before Danny Hollands nodded in the winner.
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A group of divers have commemorated one century since the end of World War One by hanging a plaque on the bow of a shipwreck off Shoreham.