CREATE TABLE table_47656 ("Nat." TEXT, "Name" TEXT, "Since" TEXT, "Goals" FLOAT, "Ends" TEXT, "Transfer fee" TEXT)

What is Since, when Transfer Fee is ' 12m'?
SELECT "Since" FROM table_47656 WHERE "Transfer fee" = '£ 12m'
SELECT "Since" FROM "table_47656" WHERE "Transfer fee" = '£ 12m'