Filming began in May 2008 at Ealing Studios in London. Ealing Studios was featured on BBC London in June 2008 going behind the scenes of the filming of "Part 2". In that broadcast its confirmed that Shauna MacDonald would be returning to play her character Sarah and that most of the other original cast members would return, some in flashbacks and possible hallucinations. The film was shot on all three of the main stages at Ealing Studios and some scenes were filmed on location at the Bourne Woods near Farnham in southwest Surrey, England. "Part 2" consisted of making 30 caves for the film while the first film only had 18 practical cave sets made.