CREATE TABLE table_name_46 (polling_institute VARCHAR, lead VARCHAR, labour VARCHAR)

Which polling institute showed a lead of 12% and a Labour share of the poll at 40.2%?
SELECT polling_institute FROM table_name_46 WHERE lead = "12%" AND labour = "40.2%"
SELECT "polling_institute" FROM "table_name_46" WHERE "12%" = "lead" AND "40.2%" = "labour"