Sir Julian Lewis: Where psychopaths are concerned, deterrence is unlikely to work, but I was interested to hear an expert from the Internet Watch Foundation, who was interviewed on Times Radio this morning, say that people who commune on the internet with those who supply them with knives could instantly bring together red flags and warn people, if they wanted to. Is it part of the Minister’s strategy to try to arrange for that? As for others, am I right in thinking that a very high proportion of people who commit knife crimes are detected? If so, surely a campaign saying, “If you commit knife crime, you will almost certainly be caught” could act as a real deterrent to those capable of being deterred.

[The Minister for Policing and Crime (Sarah Jones): Yes, the right hon. Gentleman is right that a very high proportion of people who commit knife offences are detected and charged. How we influence people who may want to pick up a knife is an interesting and difficult question. We are investing a small amount of money in trialling some communication techniques. A lot of money has been spent on the violence against women and girls campaign, which many people will have seen; it tries to educate men on violence and how to behave. We are going to do some testing on which messages might work, and which might not, to try to target people who might pick up a knife.

The right hon. Gentleman’s first question was about the sale of knives online, and whether retailers can detect issues that should be raised. The National Knife Crime Centre, which was launched a couple of weeks ago and has £1.7 million in Government funding, has a team of police officers who will investigate the sale of knives online. We are introducing legislation about buying knives in bulk; sadly, people buy, for example, 300 knives, and then sell them in their communities. Retailers will have an obligation to tell the police if people buy in bulk. We will be able to see the patterns and intervene at the right time.]