Smackdown rating for 04/21/2016 Colin Vassallo Article Published: 04/23/2016 Comments Off on Smackdown rating for 04/21/2016 Share on FacebookTweet this! Smackdown from London drew a total of 2,431,000 viewers this week, an increase of 76,000 viewers from the previous episode. (Ratings credit: Showbuzzdaily.com) Share this:FacebookTwitterRedditTumblrPinterestLinkedInPrint