"the system has worked" despite Nonesence post ages ago it didn't though there was a significant clouding of facts or cover up. The official version in the first few days was:-Tomlinson had no contact with any officers, cctv did not capture any of his movements, Tomlinsons medical treatment was hampered by protesters and bottles were thrown at medics treating him, the family accepted it was natural causes and were upset by speculation.
All of this was demonstrably false and was coming out when officers on the spot were telling their line managers they had seen the incident with Harwood. As i recall it the police version of natural causes was fed to the pathologist prior to the first autopsy.
The system only stared to work when the home movie was passed to the Guardian.