John Apter, National Chair of the Police Federation of England and Wales: “PC Andrew Harper’s shocking and needless death will live long in the memories of colleagues and police officers around the country. Our thoughts, as always, remain with his wife Lissie, his family and friends.

“The news emergency workers will receive greater protection from violent criminals is a positive step forward and a great outcome for the tireless campaigning undertaken by Lissie and supporters of Harper’s Law.

“I hope the introduction of a mandatory life sentence for anyone convicted of killing a police officer, or emergency worker, will act as a strong deterrent and stop needless violence against my colleagues.

“I would like to pay a personal tribute to Lissie for her dedication in seeing this change in law become a reality - I am proud that we have been able to support her. Thanks also to all of those who have helped in making this happen.”