As from 1st January 2021, the UK is classed as a 3rd country.
UK nationals are permitted to enter Greece if they are a permanent resident in the UK, Greece or another EU/EFA state or in Australia, Japan, New Zealand, Rwanda, Singapore, South Korea, Thailand or the UAE.
The latest travel advice can be found on the government website - Greece travel advice - GOV.UK (www.gov.uk)
Your passport will need to :-
If you need a new passport the government advises you apply in plenty of time.
You won't be able to use EU fast-track passport control and customs lanes but at Chania airport, these lanes never existed. Passengers from the UK arrived at the "extra schengen" gate where passports were always inspected although they may be inspected more thoroughly after Brexit.
When you arrive you may need to show your return ticket and may need to show you have enough money for your stay.
As things stand, you will not need a VISA. As a tourist, you'll be able to travel to most EU countries without a visa.
You'll be able to stay for up to 90 days in any rolling 180-day period.
UK nationals may have to pay for a visa-waiver scheme in order to visit many European countries.
The European Health Insurance Card (EHIC) which entitled British citizens to state-provided medical treatment if you fell ill or had an accident in an EU country, will still be valid until the expiry date on the card.
If your EHIC card has expired you will be able to apply for the new Global Health Insurance Card (GHIC) - Apply for a free UK Global Health Insurance Card (GHIC) - NHS (www.nhs.uk)
Even with the EHIC/GHIC, it was always vitally important to take out travel insurance that included health care and cover in the case of a cancellation.
You'll need to take your Great Britain or Northern Ireland driving licence with you (no change there) and you may need an International Driving Permit if you still have the old style paper licence, available from The Post Office -International Driving Permit | Post Office.
You do not need an International Driving Permit if you have the plastic licence.
Also check the government website for advice about driving abroad.
The guarantee of free roaming throughout the EU ends on 1/1/21 but the 4 main UK mobile phone providers have stated that they will not be abandoning free roaming (not at the moment at least).
You should check with your mobile provider to see if you're likely to face extra charges when you travel to Greece.
The government has also passed laws to protect customers, including :-
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