Step 1 : Introduction to the question "5. An old postcard turns up and the stamp says, "Eire", with the outline of an island country in the centre, under an arch. The value is indicated as '2', and the dominant colour is green. From what country is this stamp?"
...1. England 2. Ireland 3. Wales 4. Scotland 'Eire' is the Gaelic (Old Irish) form of Ireland. ('Erin' is normally used poetically, and the principal difference is grammatical.) This particular stamp is the old 2d. (two penny) Map of Ireland design, first issued in December 1922, and the design was one of a set of six which remained essentially unchanged until 1968!