CREATE TABLE table_79826 ("Nat." TEXT, "Name" TEXT, "Since" TEXT, "Goals" FLOAT, "Transfer fee" TEXT)

What is the nationality of the player with a transfer fee of 400k?
SELECT "Nat." FROM table_79826 WHERE "Transfer fee" = '£400k'
SELECT "Nat." FROM "table_79826" WHERE "Transfer fee" = '£400k'