 The second series disc was released in the United Kingdom on 23 January 2012 . The release included an audio commentary for " A Scandal in Belgravia " and " The Hounds of Baskerville " and a documentary called " Sherlock Uncovered " . The soundtrack album for the first series was released by Silva Screen on 30 January 2012 , and for the second series on 27 February 2012 . 
