Why? It is a matter of policy. As Chief Inspector Colin Greenwood points out here, the Home Office believes it unfair to brand a man a murderer until he has been tried, convicted, and exhausted his appeals.
As a result, murders that have not been solved are not included.
I knew that Europeans played loosey with their crime stats. But this is beyond the pale.
Orwell would be so “proud.”
Hat tip to The Smallest Minority