technically no, but you may be asked for i.d. of some kind and if you are not an Irish or UK citizen photo i.d. would be a good idea
no - it's an internal UK ferry trip
No
No. You can use any passport that is legally yours.
Yes you do. Whether you are leaving the UK by air, ferry or Channel Tunnel you need a passport and you also need one to return.
Yes you do, even the travel to Ireland from the UK has now been restricted to passport holders only.
Not officially, but you may be asked for ID by Irish immigration officials.
You don't need a passport as such but you will need an identification document with a photograph. Other documents such as a driving licence may be acceptable. This is not for entry to the Channel Island but to identify yourself to the air or sea ferry company transporting you.
I am a british citizen living in northern Ireland and I am attending a wedding in Scotland. I intend to travel to Scotland to the wedding by ferry but intend to fly back to belfast. I do not have a passport but do have a Northern Ireland electoral I.D. card - will this suffice as a means of I.D. at the airport.
As Ireland is an island, getting a car to Ireland normally involves a ferry. To get from Paris to Ireland, you could either get a ferry from France to Britain and one from Britain to Ireland, or get a ferry from France to Ireland. There are various options. You can get directly to Ireland from Cherbourg, Roscoff or Le Havre, or go to Britain by Calais to Dover and then get a ferry from places like Swansea or Holyhead to Ireland.
No. You don't need a passport to go to any part of Ireland from anywhere in the UK. However, due to increased security in recent years, you can't board an aircraft without an acceptable form of photo ID and a current passport is the best form of ID. If you are travelling by ferry, you won't need a passport, but it is advisable to check with whichever carrier you are planning to use as the rules could change.
No
The fastest way would be to use a local ferry which allows transport between France and Ireland, but one can always use the airline industry to book a flight.