CREATE TABLE table_15958 ("Song" CLOB, "Mobiles" FLOAT, "Northern Ireland" FLOAT, "Northern England" FLOAT, "Scotland" FLOAT, "Southern England" FLOAT, "Wales" FLOAT, "Total" FLOAT)

How many votes did Southern England cast whilst Northern Ireland cast 3?
SELECT "Southern England" FROM table_15958 WHERE "Northern Ireland" = '3'
SELECT "Southern England" FROM "table_15958" WHERE "Northern Ireland" = '3'