 However, citizens of the European Union, Norway, Iceland, Liechtenstein and Switzerland may enter as a right using only their passports.As a dominion of the British Empire, citizens of the Irish Free State were regarded as British subjects in common with all other members of the Empire.Historically, as late as 1942, British jurisprudence was that Irish citizenship "did no more than confer ... a national character as an Irish citizen within the wider British nationality".