Don't you have to rewind a 35mm cassette before removing it?
Angus just pulled it out to throw it away.
And Rachel just opened the back of the camera - which would have exposed the film if there had been one.
(Ludicrous that the ghostly stuff was, the criminal plotting was even more ridiculous.)
And thanks very much ITV1, for putting a bloody great spoiler in the Freeview EPG - it said that Angus had killed himself "years before" - we don't learn this until half way through the film.