Humber Guardian

Built in 2010 by Mustang Maine
Operated by Briggs Marine

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Mersey Guardian

Built in 2012 by Mustang Maine
Operated by Briggs Marine

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Severn Guardian

Built in 2012 by Mustang Maine
Operated by Briggs Marine

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Solent Guardian

Built in 2013 by Mustang Maine
Operated by Briggs Marine

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