Under current UK COVID-19 restrictions, you must stay at home. You must not leave home or travel, including internationally, unless you have a legally permitted reason to do so. Check the rules that apply to you in England, Scotland, Wales and Northern Ireland.
From 4am on 18 January, if you intend to travel to England, Scotland, or Wales from abroad, including UK nationals returning home from travel abroad, you must provide evidence of a negative COVID-19 test result taken up to 3 days before departure. If you do not comply (and you do not have a valid exemption) your airline or carrier may refuse you boarding and/or you may be fined on arrival. You must also self-isolate when you enter the UK from any foreign country except Ireland, unless you have a valid exemption. All other entry requirements and restrictions continue to apply.
If you are legally permitted to travel, check our advice on your country of destination. Some other countries have closed borders, and may further restrict movement or bring in new rules including testing requirements with little warning.