sarah everard
Labour MP told parliament she was "tired of fighting for systematic change and being given table scraps".
She tearfully told BBC Radio 4's Today programme, "I have never told this story properly."
Nick Gazzard has helped create an app that is already saving women's lives.
It was announced after Wayne Couzens was jailed for Sarah Everard's murder and approved by former home secretary Priti Patel.
David Carrick's case is yet another reminder of how much work still needs to be done within the London force.
The women's rights activist was famously photographed being restrained by police at the Sarah Everard vigil.
Yvette Cooper said it was further evidence of "appalling failures" in the police.
The student nurse left her home on July 4 – and disappeared completely three days later.
Scandals including the murder of Sarah Everard and the strip search of Child Q have blighted the UK's largest force.
Bosses initially suggested the scheme could be up and running last Christmas.