I'm not sure about this, and have some scruples about the acting, but for those who have some memories of The Avengers, The Champions and other stylised programmes, then it makes sense. There is also homage to the original film. Lucy Boynton captures the look and spirit of how young women such as Jean Shrimpton and Julie Christie were seen. The camera angles and direction are also straight out of the 60s. This may all be intentional, if not it's a happy accident.