A 15-year-old boy has been found guilty of the murder of Sheffield schoolboy Harvey Willgoose. Harvey, also 15, was killed by a fellow student outside their school cafeteria in February this year. His parents, Mark and Caroline Willgoose, have told Sky News that school knife crime is "a way of life for kids". The defendant, who cannot be named for legal reasons, had brought a 13cm hunting knife with him into All Saints Catholic High School, Sheffield, stabbing Harvey twice in the chest just a