www.bbc.co.uk/news/uk-53588705
Prosecution rates and convictions have fallen to record lows. Referrals to CPS down 40% since 2014, due to the volume of digital evidence police need to go through (and let's be clear, that's the victims phone and personal messages as well as the offenders, and probably in more depth for the victim).
Police now also needing corroborating evidence if there is a dispute about consent to refer, and not referring cases where victim was drunk/on drugs.