Theaters normally use posters to advertise films but in this case they are using a promo shot. Cineworld Cinemas now have Knock Knock listed on their site in the coming soon section. The film will open in the following theaters on June 26:
The film is NOT listed in the ‘coming soon’ section at the Showcase Cinema or the Odeon.
Note: This is not a comprehensive list of UK cinemas but for those in the UK interested in seeing the film, it is a starting point.