The "haunted" house in this episode and the stylish bridge leading to it are not CGI'd but are on (and lead to respectively) an island in tbe Thames near Weybridge in Surrey.
This episode had its world premiere on German TV-Channel ProSieben on 30th of March 2009, just a couple of days before its UK-premiere. Minutes after the German airing ended it was viewable on ProSieben's website for free (only in German).