The Crown Prosecution Service (CPS) does not maintain a central record of Crown Court trials which resulted in a non-conviction outcome due to a prosecution failure to disclose evidence to the defence. This information could only be obtained by examining CPS case files, which would incur disproportionate cost.
As part of the work under the National Disclosure Improvement Plan, the CPS has introduced new data collection measures designed to monitor disclosure performance. These measures include all prosecutors now being required to confirm at the conclusion of every case that has been stopped after charge whether disclosure had a primary or contributory impact on the outcome. This will allow us to capture more data than ever before on cases in which disclosure does not ultimately cause the case to end but where it was a secondary factor, and will enable performance to be examined by police and prosecutors at local, regional and national level and to drive further improvements. The first set of this data will be published in due course.