Great poll! However, there is a complex remark and further suggestion below.
The option #16. Seven Up! (1964 TV Short) is not describing the whole project voted by Sight & Sound. The 16th place was taken thanks to the series of interviews, and Seven Up! (1964) is only the first one, as well as the only one directed by Paul Almond. All the rest were directed by Michael Apted for more than 50 (!) years, it's a terrific effort.
I understand those "series" has no single page as series to link in a list and poll. But to leave Paul Almond aside would be a misfortune dismissal, I think. So, I suggest to add the description to the above-mentioned option #16:
Including all the further interviews directed by [b][link=nm0000776][/b] at [b]7-year intervals[/b]: - [link=tt0066356], - [link=tt0075610], - [link=tt0088650], - [link=tt0101254], - [link=tt0164312], - [link=tt0473434], - [link=tt2147134], - [link=tt8929142].
=========================== the above should result into this: ===========================
Including all the further interviews directed by Michael Apted at 7-year intervals: