Here's why:
* Legacy: Hammer had already established itself as a major force in horror cinema in the 1950s and 60s with iconic films like "Dracula" (1958) and "The Mummy" (1959).
* Continued Success: They continued to produce successful horror films throughout the 70s, including "The Devil Rides Out" (1968), "Taste the Blood of Dracula" (1969), and "Frankenstein and the Monster from Hell" (1974).
* Style: Hammer's films were known for their gothic atmosphere, lush visuals, and strong performances, which resonated with audiences.
* Influence: Hammer's work heavily influenced the horror genre, particularly in the UK, and paved the way for a new wave of British horror filmmakers in the 70s.
However, it's worth noting that other British companies also contributed significantly to horror cinema in the 1970s:
* Amicus Productions: Known for anthology films like "Dr. Terror's House of Horrors" (1965) and "Tales from the Crypt" (1972).
* Tigon British Film Productions: Responsible for cult classics like "The Blood on Satan's Claw" (1971) and "The Wicker Man" (1973).
Ultimately, while Hammer Film Productions dominated the 1950s and 60s, the 1970s saw a more diverse landscape of British horror filmmakers and studios making their mark.