It depends on what you mean by the best - eg, the greatest variety? Number of screenings? Or just the cheapest tickets?

So you may like to explore the Time Out London cinema guide. Here you will find information on every kind of cinema venue, whether you are looking for the largest, the one where you are most likely to meet the stars, or even cinemas where they don't sell popcorn, in case you hate the sound of people munching!

You can also find information there on specialist cinemas, such as the ones that show a lot of classic films. Or if you are looking for venues that have a lot of style and show a mix of popular and arthouse films, you could try the Electric Cinema in Notting Hill, or others which have been highly rated by visitors. Some of these have special seasons devoted to a particular theme, which may be interesting to you.