Most of the Sherlock works on the Archive aren't tagged with 'Sherlock BBC,' so I think that's part of the problem -- you should use 'sherlock (tv)' instead. Also, you'll need to remove the comma at the end if you're only using one term.

Since 'general audiences' is in your whitelist, you'll still see Sherlock works with a General Audiences rating. If you don't want to see then, the whiteList Array should be totally blank -- no quotation marks, no spaces, just the two parentheses.