CREATE TABLE table_17469 ("#" FLOAT, "Episode" TEXT, "Director" TEXT, "Writer" TEXT, "Original airdate" TEXT, "Viewers" TEXT)

who is the writer where viewers is 5.16m
SELECT "Writer" FROM table_17469 WHERE "Viewers" = '5.16m'
SELECT "Writer" FROM "table_17469" WHERE "Viewers" = '5.16m'