CREATE TABLE table_75752 ("Election" FLOAT, "Liberal Party" TEXT, "Conservative Party" TEXT, "Labour Party" TEXT, "Independents" TEXT, "Control" TEXT)

Who was in control the year that Labour Party won 12 (+6) seats?
SELECT "Control" FROM table_75752 WHERE "Labour Party" = '12 (+6)'
SELECT "Control" FROM "table_75752" WHERE "Labour Party" = '12 (+6)'