In reply to Flinticus:
> (i..e. don't tell me to use Google - that's a hole leading into an Escher rabbit warren with Mobius loops)
OK. But the Irish government site is pretty clear:
https://www.gov.ie/en/press-release/7894b-post-cabinet-statement-resilience...
"Passengers arriving into Ireland from outside EU/EEA
From 19 July, Ireland will also broadly align itself to the EU approach to non-essential travel into the EU from third countries.
To protect its citizens against importation of variants, an ‘emergency brake’ mechanism will be coordinated at EU level to react swiftly to the emergence of a variant of concern or variant of interest.
Government advice will be to avoid travel to a country where the emergency brake has been applied.
Scenario One – journey originates in a country to which the EU has not applied an ‘Emergency Brake’
If passenger has valid proof of vaccination, no travel-related testing or quarantine will be necessary.
If passenger does not have valid proof of vaccination, they will need to:
present evidence of a negative RT-PCR test result within 72 hours prior to arrival into the country
self-quarantine
undergo post-arrival testing - this will be provided through the HSE
Scenario Two – journey originates in a country to which the EU has applied an ‘Emergency Brake’
If passenger has valid proof of vaccination, they will need to:
produce a negative result from a RT-PCR test taken no more than 72 hours before arrival
undergo self-quarantine
undergo post-arrival testing - this will be provided through the HSE
If passenger does not have valid proof of vaccination, they will need to:
produce evidence of a negative result from a PCR test undertaken no more than 72 hours before arrival
undergo mandatory hotel quarantine
undergo post-arrival testing"
So, assuming you have proof of full vaccination, it'll depend on whether the EU has applied the Emergency Brake to the UK at that time - if it hasn't, you won't need to test or quarantine; if it has, you'll have to take tests before and after arrival, and quarantine.
So, no guarantees for advance bookings really (especially as the Delta Variant is rife in the UK), but if you can do it at short notice at a point the brake isn't on, you won't need to test.