A....amnesty for knives!

[Slyspy]

Ceasar that knife may get you into trouble because it is a locking blade I think, though it may be small enough to avoid this. It will certainly get you into trouble because it is a disguised weapon. As noted in the article an number of disguised weapons are completely illegal. Even if your knife isn't covered on the banned list I'm sure any inventive copper could find a reason to confiscate it.

Edit:
Better to be happy slapped by a bunch of drunk teens with knives or without? In fact will a pocket knife help in the face of a determined assault by such a gang? Besides which such behaviour is not as widespread as all that. To be honest I believe that the amnesty is really after more than pocket knives ie combat and hunting knives, swords, bayonets etc.