http://www.homeoffice.../hosb1011?view=Binary
The relatively low number of homicides, attempted murders, rapes and sexual assaults that involve the use of a knife or sharp instrument means that care should be taken when comparing these figures over time (Table 3.07).
• Provisional data show that there were 214 knife or sharp instrument homicides in 2010/11, compared with 201 the previous year.
• There were 217 knife or sharp instrument attempted murders in 2010/11 compared with 240 in 2009/10.
• The number of threats to kill involving the use of a knife or sharp instrument was 1,395 in 2010/11 compared with 1,469 in 2009/10.
Information on offences recorded by the police can be supplemented by that obtained from
the BCS, although the small number of incidents involving a knife reported means that trends should be interpreted with caution. The 2010/11 BCS estimates that knives were used in six per cent of violent incidents (Table 3.04). This figure has consistently remained within the range of five to eight per cent of incidents since 1996.
So, according to government statistics, not much change there. I suspect the change is in the newspapers' wish to sell more newspapers with overplaying the importance. Yes, it is awful that young people are stabbing each other, but we can't blame anything in particular. Knives are easy to get hold of or even make. Youngsters are growing up with less self-control in my opinion.