Holidaymakers have no right to claim entry into a foreign country, even if they have bought vacation there, and must comply with all passport rules.
If you travel to an EU hotspot such as Spain or France, your passport should be issued less than 10 years before your scheduled date of entry.
Until 2018, the UK government has allowed an indefinite period for passports to be added to new passports, meaning some UK passports are valid for more than 10 years.
This was not a problem before Brexit, but without the Ireland tour it is now.
Also, your passport must be valid for at least three months from the day you plan to leave the EU.
Rules change for non-EU countries. In Turkey, for example, your passport must be valid for six months from the date of your arrival.
Where for the United States or Canada, it should only be valid for the duration of your stay.
Despite the risks, one-third of Britons do not know the rules of their destination, GoCompare’s research shows.
Its travel spokeswoman Seri Macmillan said it was important to check the entry rules as soon as possible, as it usually takes 10 weeks to get a new passport.
“Going to the airport would be heartbreaking, just to turn away,” he added.
The State Department provides a list of entry requirements for different countries.