Liam Allan trial: Why disclosure failings can prove crucial

The Met Police is to hold an "urgent" review of a rape case after being accused of failing to disclose vital evidence.

Liam Allan, 22, was charged with 12 counts of rape and sexual assault but his trial collapsed after police were ordered to hand over phone records.

The BBC's Legal Correspondent Clive Coleman gives his analysis on the issues surrounding the case.

15 December 2017