Only Irish and UK citizens can travel without a passport between the 2 countries
That will depend on various factors, like your nationality and what your requirements are for getting to England.
not legally but it may be a requirement of your airline, so you need to check with them
no, as long as you have a passport
no you dont
not if you are an Irish or UK citizen. Other nationalities may be asked to produce passports/id cards
If you hold an Irish passport, then the answer is no. However, you are likely to be asked for photo ID or proof of nationality so the most obvious document to bring is your passport. Whenever you are travelling to another country, bring your passport.
You need a passport to enter any country, that's why you have passport control at airports.
yes. which ever way you leave a country, u need a passport
Yes you would need a passport. You would also need a visa.
definitely, yes
As the "Common Travel Area" is in place, you do not need a passport to go to Dublin from the UK. When flying between the UK and Ireland it is best to ask your airline what form of ID will be accepted.
Yes, you do need your passport.