'The Hateful 8' has been passed 18 uncut for UK cinemas
However, speaking in Variety Magazine, Tarantino has confirmed that two versions of the film exist. He said:
"The roadshow version has an overture and an intermission, and it will be three hours, two minutes. The multiplex version is about six minutes shorter, not counting the intermission time, which is about 12 minutes.
But I actually changed the cutting slightly for a couple of the multiplex scenes because it's not that. [...] The sequences in question play in "big, long, cool, unblinking takes" in the 70mm version [...] It was awesome in the bigness of 70, but sitting on your couch, maybe it's not so awesome. So I cut it up a little bit. It's a little less precious about itself." Tarantino Says He Cut a Different Version of ‘The Hateful Eight’ | Variety