Downton Abbey promo idea

Now that Downton Abbey will see a third season, before it goes live next year, I'd like to see the studio behind the series record a promotional video for the show, and this is my idea: The full cast on show locations, in full costume, performing a lip dub of George Harrison's 80s song "Got My Mind Set On You". 

Bonus points if it features all the cast members paired up that tend to get paired up on screen, Matthew & Mary, Mr. Bates & Anna, Maggie Smith & Matthew's mom, Thomas & Sarah, Mrs. Patmore & Daisy, etc.

It'd be cheap to make, simple to do (probably a one-day shoot), and would almost certainly go viral, bringing the show to millions of potential viewers.