Caroline Willgoose has told the Mail she blames All Saints Catholic High School for failing to act on a series of red flags before her 15-year-old son Harvey was stabbed.

Harvey Willgoose, 15, was stabbed in front of horrified children by another 15-year-old boy who had brought a hunting knife to school

The 15-year-old, who cannot be named for legal reasons, stabbed Harvey Willgoose, also 15, in the heart during their lunch break at All Saints Catholic High School in Sheffield on…