If you are looking for information regarding this specific episode for a "paper" (like a review or academic analysis), here are the core details: Episode Overview: "Hidden Depths" Vera (Season 1, Episode 1) Original Air Date: May 1, 2011 (UK)
HDTV (captured from a high-definition television broadcast). Vera.S01EP01.HDTV.1080p.x264.[ExYuSubs]
Brenda Blethyn as DCI Vera Stanhope and David Leon as DS Joe Ashworth. If you are looking for information regarding this