CREATE TABLE table_26808 ("Episode no." FLOAT, "Airdate" TEXT, "Viewers" TEXT, "BBC Three weekly ranking" TEXT, "Cable rank" TEXT)

List the number of viewers when the cable rank for Russell Howard's Good New was 5.
SELECT "Viewers" FROM table_26808 WHERE "Cable rank" = '5'
SELECT "Viewers" FROM "table_26808" WHERE "Cable rank" = '5'