As stated above, just take your passport. It will save you time and ballache. On the Humberside to Aberdeen flight they ask for your passport, even going offshore in the uk sector requires a passport.
I'm not too sure who I am flying with as my Email account insists I don't know my password.
I have hired a car over there so will be taking my driving licence too, but my mother has no passport. And we go on the 31st Just hope this fast track system is as fast as they say.
Didn't need one on the road from Co. Antrim or on the ferry back Dublin-Holyhead. Flying one can use any approved photo ID (driving licence, shotgun cert. etc.) but it would make life a bit easier with a passport.
I travelled to Eire last autumn with just my driving licence, I had mislaid my passport. Had no issues. Although I was stting myself a bit! They did check that I was born in the UK though.
Don't assume all carriers have the same rules when flying into the Republic. I sure Ryan Air want to see a passport. They are also the only airline that won't let a baby fly into the Republic without a passport of their own.