With any air travel photo ID is required for all passengers, if in doubt contact your flight provider
no, but some form of photo i.d. is always useful to have, and many airlines insist on passengers carrying passports
No, you will need some sort of ID issued by the state of your home country. If traveling from England to Northern Ireland (both within UK) then driving license will do if flying. But it really depends where you are coming from. It's easier to get into Rep Ire than N. Ire.
No. You would need a national identity document, ideally a passport.
A photo identification is necessary to fly from England to Northern Ireland. The airlines prefer a driver's license or passport identification picture. The passport is not necessary if the person flying is a citizen of either country.
no
NO
In theory, no. There has always been unrestricted travel between the Republic of Ireland and the United Kingdom (which includes England). However, because of increased security levels in recent years, an acceptable photo ID is required before anyone can board a flight and a valid passport is the most acceptable form of ID.
The website Ireland Pictures is full of pictures of Ireland. These pictures vary in showing day to day life, nature, architecture, etc. in representing Ireland.
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.
Photo ID isn't obligatory anywhere in Britain.
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.