Do I need a Passport or a Visa?
Check the voyage information listed under each voyage to find out whether you require a passport. If it’s noted that a passport is required and the voyage starts and finishes in the UK, it does not guarantee that you’ll visit a foreign port but the option to might be available.
It’s your responsibility to check whether you need a visa for any of the countries you may visit including the Channel Islands. Please note that the rules may be different for travelling by sea compared with by air.