The boy, who is 16 and cannot be named for legal reasons, was found guilty of wounding with intent to cause grievous bodily harm after he attacked Vicki Williams in February.

Swansea Crown Court previously heard how the pupil, who was 15 at the time, stabbed teacher Vicki Williams in the head at Milford Haven Comprehensive School in Pembrokeshire in…

The court previously heard that the boy approached her desk to ask her to check his work