While the BFI IMAX gets the big headlines, (having the UK’s largest 1.43:1 IMAX screen and 70mm IMAX film projection will do that), the screens in the more conventional BFI Southbank are also worthy of note.
Originally opened in 1957 at the National Film Theatre, the Southbank complex houses four screens, known as NFT1-4, showing an eclectic range of films from interesting new releases to classics.
Source: Why The BFI Southbank NFT1 Is One Of The Crown Jewels Of The London Film Scene