It's dark, it's a labyrinth, it will make a great chase scene. The caves go on for miles and miles and are totally unique. They can look like stone even though they're chalk.
Recces can only be organised Wednesdays to Sundays - Filming is only allowed on Mondays and Tuesdays unless small crews that don't mind sharing the space with other visitors. Being a cave, it is very echoey for sound.
*Location is not available in school holidays due to being open 7 days a week*