How do I stop a mobile data network from appearing and using data

Hi, I work on a UK ferry that has its own mobile Internet network that passengers can use (MCP). This network turns on automatically when leaving port and costs a astronomical amount of of money to use, sometimes I leave my mobile data on in error and get hit with charges. My question... Is there a app or something in settings that can stop or restrict a certain mobile network so your phone will never use it?

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