According to EU Directive 2004/38/EC, an EU national has the right of entry to the territory of another Member State by production of a valid passport or National Identity Card, confirming his citizenship. However..
Article 5(4) of this Directive states:
|Where a Union citizen, or a family member who is not a national of a Member State, does not have the necessary travel documents or, if required, the necessary visas, the Member State concerned shall, before turning them back, give such persons every reasonable opportunity to obtain the necessary documents or have them brought to them within a reasonable period of time or to corroborate or prove by other means that they are covered by the right of free movement and residence.|
Further, Cornblakes6 is able to prove by other means that they are covered by the right of free movement and residence, since he is able to furnish a copy of the entry of his birth in the Irish Foreign Births Register. Under Irish nationality law this confirms his Irish citizenship. This is weak, however, since UKBA staff are unlikely, nor are they required, to be coherent with Irish nationality law.