The government's reminding people to make sure they have all the correct documents with them when they're travelling.
In an update, it says travelling within the Common Travel Area is unchanged - but the UK introduces the Electronic Travel Authorisation Scheme from Wednesday, February 25.
Those with British or Irish passports, or existing Immigration Status to live, work or study here won't need an ETA.
But the government says you should check what you might need before you set off - and contact the Island's Immigration Service if you need to update details before going away.
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