Nursery teacher explains why she forgives machete attacker 20 years on

A nursery teacher who protected her schoolchildren from a machete-wielding man has told ITV's Good Morning Britain how she has come to forgive the attacker.

Lisa Potts won a George Medal from the Queen for her bravery in the shocking random playground attack at St Luke's Infant School in Wolverhampton in 1996.

Lisa Potts, seen on the day she returned to work in 1997, alongside some of the children injured in the attack. Credit: PA

Three children and four adults were injured in the attack after Horrett Campbell leapt over a hedge into the playground and started slashing at anyone in sight.

Potts, who was 21 at the time of the attack, said she could never forgive Campbell when he was detained indefinitely in a mental hospital.

But two decades on she said she has had a change of heart.

Potts, who is now the mother of two boys, was given a special thank you for her bravery from the mother of one of the children whose life she saved.

Francesca Quintyme, who as a four-year-old was scarred on her face for life in the attack, read out the letter her mother Sheridan had written.

"Without a doubt Lisa saved my baby's life," the letter said. "I give God thanks for her and for her courageous act to preserve life. This act alone is a God-given instinct."

Horrett Campbell was given an indefinite sentence in a secure mental hospital after being found guilt of seven counts of attempted murder. Credit: PA

Potts, who almost lost an arm in the attack, said she experienced a "fight or flight" moment when Campbell invaded the playground.

She said she still keeps in contact with some of the children in the attack.