CREATE TABLE table_19806 ("#" FLOAT, "Episode" TEXT, "Writer" TEXT, "Director" TEXT, "Original air date" TEXT, "Viewing figure" TEXT)

Which episode has been viewed 6.34 million times?
SELECT "Episode" FROM table_19806 WHERE "Viewing figure" = '6.34 million'
SELECT "Episode" FROM "table_19806" WHERE "Viewing figure" = '6.34 million'