Do you required departure stamp to enter Northern Ireland?

Hi, 
My background is that I am a dual citizenship between Thailand and Northern Ireland. I haven't travel back to Northern Ireland since I was a child (more that 15 years gap). Now that I have complete my university study, I am planning to relocate back to Northern Ireland (Newry). I acquired my new Irish passport through Embassy of Ireland in Thailand 2 years ago, and the question is

Since I got my new passport outside the country, I don't have the departure stamp. Will there be any problem or any required process if I traveling back to Northern Ireland?

Many thanks,

Hi Akkara, 

Thanks for reaching out. It is great to hear you will be returning after 15 years to Newry.

I would recommend reaching out to your local Irish Embassy/Consulate prior to visiting the Republic of Ireland, and your local British Embassy/High Commission or Consular Office, should you wish to fly directly to Northern Ireland. They will be more versed in providing you with a definitive answer on the departure stamp. 

Let me know if you have any other questions and I would be glad to help where I can. 

Cathaoir