18 Nov 2021 5:28 PM:
jimmyjab
I too have an Irish passport and will be travelling from Manchester to Spain in December. I will not be having my Irish passport stamped as I am (as you have stated) classed as an EU citizen so have the right to stay up to 180 days in any rolling year. Regardless of where your flight, sailing or border originates you are classed as an EU citizen, so to answer your question I would not expect you to have your Irish passport stamped. Re windys comment about the GHIC health card they are correct that to obtain one of these you would need to be a resident of Ireland, but you can use your UK issued one along with your UK passport if you should need to.
Thread:
travelling between UK, Gib and Spain with Irish passport
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