A quick hypothetical. If I was assaulted and provided video evidence to the authorities which the police used to successfully catch my assailant would the police have to share my assailants details with me? Let's assume that the assailant was given a formal warning but not charged and I wanted to pursue Civil action but I didn't have the assailants details, could the police refuse to tell me?
(Not concerned about the the likelihood of a civil case succeeding, just a hypothetical)
Specifically I'm asking about the UK. Do the four UK Nations vary at all in this regard?