From 19 July, if you have valid proof of full vaccination, you do not need to provide evidence of a negative Covid test before travelling to Ireland from Britain (see rules here). Proof of vaccination can be provided through the NHS Covid Pass, a vaccination status letter or a paper vaccine card.
Children aged 12 and over will need a pre-departure negative PCR test, but this will not be required for children aged 11 and under.
If you have not been fully vaccinated, you must:
Present evidence of a negative RT-PCR test result within 72 hours prior to arrival into Ireland.
Self-quarantine for 14 days (this can be reduced to a minimum of 5 days with a negative PCR test which will be provided by the HSE in Ireland from day 5 after arrival).
Undergo post-arrival testing.
There are no restrictions on travel between Ireland and Northern Ireland.
You must still complete a Passenger Locator Form if travelling from Britain to Ireland. You do not need to complete the form if travelling from Northern Ireland to Ireland. You can find the Passenger Locator form here, it can be completed online or in paper form.
You do not need to complete a Passenger Locator Form if you are travelling from Ireland to Britain and you were there for 10 days or more.
Links
See rules on arriving in England from Ireland here.
Rules for other UK nations can be found here.
The rules for travelling to Ireland from Britain are here.