Figures published by London Trading Standards show children as young as 13 were able to buy knives in test purchasing carried out across the capital.

It is illegal to sell knives to anyone under 18.

During the whole of 2016, 725 test purchases were carried out by London Trading Standards and the Metropolitan Police using child volunteers.

The vast majority of shops visited refused to sell but 96 retailers sold knives and bladed articles to children as young as 13.

Trading Standards Officers carried out the test purchasing as part of the crime prevention element of ‘Operation Sceptre’.

This Metropolitan Police initiative is aimed at reducing knife crime and reducing the number families affected by knife crime.

Minister for Vulnerability, Safeguarding and Countering Extremism Sarah Newton said: “Selling knives to children is illegal and I am delighted that London Trading Standards are taking action to enforce this and have found that the vast majority of retailers are complying with the law.

“Knife crime can have devastating consequences and this Government is acting against it, including banning the sale of so-called ‘zombie-knives’, supporting Operation Sceptre and expanding our work with retailers to stop the underage sale of knives.

“But the results of these test purchases shows there is still more to be done and we will continue to work together to do all we can to keep our children and communities safe.”

In many cases young Police Cadets assisted with the work -the average age of the volunteers was 14 years.    

As a result of the sales 19 traders were prosecuted by Trading Standards, or have cases pending, whilst others received official warnings and compliance advice.    

Steve Playle, a spokesperson for London Trading Standards said: “This partnership work to tackle the supply of knives to children has utilised London Trading Standards expertise in conducting test purchasing.

“Whilst it is commendable that 87% of shops refused to sell it is concerning that children as young as 13 were actually sold knives.

“The illegal sale of knives can significantly impact on the health, safety and welfare of young people and the communities in which they live, so it’s important that we work together to prevent them.”

Anyone with information about shops that sell age restricted products to children can report it anonymously via the London Trading Standards reporting tool at www.londontradingstandards.org.uk.