text: I'm *fairly* sure, but I haven't gone inside to check. I walked past it recently and they appear to be connected; there's no visible signage on the "back" building to show another use.
  
  FWIW, English Heritage\OS map shows it as one building - http://www.historicengland.org.uk/listing/the-list/list-entry/1297977 - and it's a fairly common layout for cinemas\theatres like this.