Some of the knife crime victims whose deaths have led to Ronan's Law after long campaign

The crackdown on killer 'zombie knives' and 'ninja swords' follows a long-running campaign by the Express & Star.

The newspaper first called for laws restricting the sale of so-called 'zombie knives' at the start of 2016, in response to online adverts for knives up to 2ft long, under names such as Head Splitter, Death Dagger and The Skinner.