Trewick played in every league game for Oxford during the 1984–85 season.
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On 8 March 2010 Trewick was sacked, with chairman and former manager Graham Turner taking the job on a temporary basis.
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He was offered the role of manager at Hereford, which he accepted on 24 April 2009, after Graham Turner announced his resignation.
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After the relegation of Hereford United to League Two, Trewick assumed the role of manager from Graham Turner, but he was dismissed from the Hereford manager's post on 8 March 2010.
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During West Brom's visit to China he entered football history by, in reply to a question about the Great Wall, remarking "Impressive, isn't it? But once you've seen one wall, you've seen them all!".
John Trewick, professional footballer for Newcastle United in the early 1980s
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