The Foreign Office (FCDO) is advising people considering going abroad over the festive period to do their research before booking a trip.
Consumers are being urged to inform themselves of their local rules and the possible disruption they may face if they choose to go overseas as lockdown in England is replaced by regional tiers.
Residents in Scotland, Wales and Northern Ireland should consult the regulations that apply to them.
People in England are permitted to travel abroad from today (Wednesday), subject to any restrictions in place at their destination.
However, those in Tier 3 should avoid leaving the area other than for reasons such as work, education or caring responsibilities under government regulations.
Inbound international travel will continue to be governed by the travel corridors.
Travellers will need to quarantine for 14 days if arriving from or having travelled through a non-travel corridor country or territory.
All arrivals will need to abide by the regional restrictions in place when in the UK, according to the FCDO.
Passengers arriving into England from countries not featured on the government’s travel corridor list will have the option to take a private Covid test after five days of self-isolation from December 15, with a negative result releasing them from the need to isolate.
The FCDO continues to advise against cruise ship travel “at this time”.
It said: ”This is due to the ongoing pandemic and is based on the latest medical advice. This advice is kept under constant review.”
Nigel Adams, minister responsible for FCDO travel advice, said: “Coronavirus has fundamentally changed the way we travel, meaning it’s more important than ever to consider the need for a trip abroad and to be prepared. Our staff will do all they can to help British people in difficulty, but travellers must take responsibility as well.
“Different destinations may introduce new rules and restrictions with little notice as they respond to the pandemic, so it’s vital that people plan their travel and understand that disruption is possible.”