Police failed to arrest Harrison Simpson, 22, despite a warrant being issued 18 months before he murdered and sexually assaulted two-year-old Isabelle Welsh

WARNING: DISTRESSING CONTENT. EXCLUSIVE: As Alexandra Walker and Harrison Simpson are jailed for the murder of two-year-old Isabelle Rose Welsh, questions are being raised about…

Isabelle Welsh suffered a sickening 'campaign of violence' at the hands of Harrison Simpson, 22, and Alexandra Walker, 26, in the weeks before her death in September last year.