No.. Even though your a European citizen you must produce a passport at port of entry..
only if you are going to Northern Ireland, you need a passport to travel between England and Ireland.
You don't need a passport to travel between the UK and the Republic of Ireland.
If you are not an Irish or British citizen, you will need a passport. Ireland and Britain have a free travel area arrangement, but most people will still bring a passport anyway.If you are not an Irish or British citizen, you will need a passport. Ireland and Britain have a free travel area arrangement, but most people will still bring a passport anyway.If you are not an Irish or British citizen, you will need a passport. Ireland and Britain have a free travel area arrangement, but most people will still bring a passport anyway.If you are not an Irish or British citizen, you will need a passport. Ireland and Britain have a free travel area arrangement, but most people will still bring a passport anyway.If you are not an Irish or British citizen, you will need a passport. Ireland and Britain have a free travel area arrangement, but most people will still bring a passport anyway.If you are not an Irish or British citizen, you will need a passport. Ireland and Britain have a free travel area arrangement, but most people will still bring a passport anyway.If you are not an Irish or British citizen, you will need a passport. Ireland and Britain have a free travel area arrangement, but most people will still bring a passport anyway.If you are not an Irish or British citizen, you will need a passport. Ireland and Britain have a free travel area arrangement, but most people will still bring a passport anyway.If you are not an Irish or British citizen, you will need a passport. Ireland and Britain have a free travel area arrangement, but most people will still bring a passport anyway.If you are not an Irish or British citizen, you will need a passport. Ireland and Britain have a free travel area arrangement, but most people will still bring a passport anyway.If you are not an Irish or British citizen, you will need a passport. Ireland and Britain have a free travel area arrangement, but most people will still bring a passport anyway.
That will depend on your nationality. Irish and British citizens can travel between Ireland and Britain without needing a passport, though many will bring their passport with them anyway. If you are not from Ireland or Britain, then you will need a passport, and may even need a visa.
That will depend on your nationality. You may live in England, but have a different nationality, so you would not have the same conditions of entry as someone who is has a British passport. See below for details on getting into Ireland.
Generally you will need a passport to visit Ireland. As a general rule, you should always get a passport when travelling internationally. The fact that you grandmother is Irish, does not mean you can travel to Ireland without any passport. You may actually be entitled to get an Irish passport. See the related question below for details of documents needed to visit Ireland.
Yes
Yes.
For the EU citizen, to travel inside EU (like from Ireland to Poland) a valid ID is required, but not necessary a passport.
No. You must possess a valid travel document issued by New Zealand that is recognised by Ireland (and also any third countries you are transitting through). All countries recognise a New Zealand passport and most would recognise the New Zealand Emergency Travel Document. You do not need a visa to enter the European Union (includes UK and Ireland) on a NZ passport.
A passport is not needed to travel between the UK and Ireland.
No. There is a common travel agreement between Ireland and Britain.