The film might not even be completely ready (the computer generated effects may not have been
added).
But one or two senior film examiners will watch it and suggest to the company what category the film will most likely get, based on what they have seen.
Then when the film is finished, maybe a few weeks or even months later, it will come back to the BBFC, to be seen by two film examiners, and the category is confirmed.
We usually watch films and videos in pairs, and it took two days to classify HP 3.
Were there any disagreements over the rating? What happens in this circumstance?
BBFC: There were no disagreements over the rating for HP 3, as all the examiners felt that the 'scary' scenes and mild bad language would be fine at PG.
If the two examiners in the team do disagree, for example if one examiner thought a film should be PG and the other thought it should be 12A, then the film is seen again by a second team of three examiners.
How did rating the 3rd Harry Potter film compare to rating 1 and 2?
BBFC: HP 1 was quite a light and easy film to watch, with less scary moments than HP 2, which I helped to classify.