The foreign office has updated its advice for travel to Ireland to reflect a requirement to show a negative Covid-19 test from Friday.
The Irish government confirmed the requirement on Tuesday for all travellers aged 12 and over.
The rules do not apply to travellers from Northern Ireland, unless they have travelled outside the island of Ireland in the two weeks before travel.
All other arrivals must show either a negative antigen test carried out by “an approved professional” taken within 48 hours of travel, or a negative PCR test taken within 72 hours.
The FCDO advice page adds: “Travellers who do not have a Digital COVID Certificate based on vaccination or recovery have to show a negative PCR test, taken no more than 72 hours before arrival in Ireland.”
The new entry rules now mean there are different restrictions for travellers from Great Britain to Ireland than for Irish visitors to Great Britain.
Tightened restrictions introduced by the UK government on Saturday include an exemption for those travelling from the Common Travel Area, which includes Ireland.