You can also check out their list of the top 100 British films, and best music in films. As always, be careful not to read descriptions of movies you haven’t seen yet if you want to avoid spoilers.
They’ve also been doing a poll of critics every decade since the fifties, asking them to name the top 10 films of all time. The historical lists are interesting. The latest poll was in 2002. This time they asked critics to name the best directors as well, and they also decided to poll directors for their top films and directors.
If you’re more interested in what the public has to say, you can look at the top 100 films of all time based on ticket admissions in Britain. Don’t be surprised if there are a lot of old movies at the top of the list. Movies used to be a lot more popular in the past before television came into the picture.