Is an EEA registration certificate (EEA1) valid ID for travel within the Common Travel Area?

Is an EEA registration certificate (EEA1) valid ID for travel within the Common Travel Area? - Crop unrecognizable person demonstrating British passport

I am an Irish citizen, resident in the UK & looking to fly back to Ireland without my passport (currently submitted for a driving licence application).

Wikipedia lists a number of documents as valid ID for travel to Ireland within the Common Travel Area, such as a work photo ID or bus pass, (though I unfortunately don't have these).

It also mentions "National ID card/Government-issued photo ID cards". I do have an EEA1 residence cert — but I presume this wouldn't count as a National ID (which I think means the credit-card style ID carried in Spain, Germany, etc.)

Would it be considered a Government-issued photo ID card though? It's a blue, cardboard document rather than a plastic ID card:

EEA1 Specimen image






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