This page is useful for up to date advice on entering Ireland
https://www.gov.ie/en/publication/e8...travel-advice/ The helpline listed there is also useful. I called them last week to ask a few questions. I have a UK passport, but live full time in Ireland. I am technically allowed to enter the UK from Ireland without quarantine, so I asked what would happen if I were to fly to London and back in early August. They said the policy may change, but currently that upon my return I would have to self isolate at home for 14 days and that police may be assigned to check in on me.