Under the current travel guidelines, travellers can only leave or enter the UK for work purposes, however, there are some exceptions such as for health reasons.
You must not travel abroad for a holiday, and you need to check the entry requirements for the country you are travelling to.
If you are planning to travel to England, Scotland, Wales, or Northern Ireland from abroad, including UK nationals returning home, you must provide evidence of a negative Covid-19 test result.
This must be taken up to three days before departure.