Erith Town completed a cup double after scoring a late winner to finally sink Croydon in the Kent Senior Trophy Final on Sunday. Southern Counties East League Erith won the Challenge Cup on penalties against Corinthian last month and added a second piece of silverware to their trophy cabinet at Maidstone’s Gallagher Stadium. It had looked as though experienced goalkeeper George Kamarasi was going to almost single-handedly keep Erith at bay as he produced a series of excellent saves in the second half. But James Dyer scored twice in the last 13 minutes to finally end Division 1 Croydon’s chance…