CREATE TABLE table_66681 ("Date ( s )  Released" TEXT, "Polling institute" TEXT, "Nationalist" TEXT, "Labour" TEXT, "Democratic Alternative" TEXT, "Undecided/ No answer" TEXT, "Lead" TEXT)

Which polling institute showed a lead of 12% and a Labour share of the poll at 40.2%?
SELECT "Polling institute" FROM table_66681 WHERE "Lead" = '12%' AND "Labour" = '40.2%'
SELECT "Polling institute" FROM "table_66681" WHERE "Labour" = '40.2%' AND "Lead" = '12%'