What are the rules for UK nationals without residence in the EU to travel to the EU?
UK nationals can travel and stay in the EU for up to 90 days in any 180-day period as tourists. You may need a visa or permit to stay for longer, to work or study, or for travelling for business.
At the border you may need to show a return or onward ticket and that you have enough money for your stay. Moreover, you’ll need your passport to have at least 6 months left and be less than 10 years old (even if it has 6 months or more left).
If you are the family member of an EU citizen, and are travelling with them, you will have EU rights as their family member. For more details see https://www.the3million.org.uk/travel-to-the-eu.