Please define an illegal knife.
I won't attempt to define it. I will let the law do it for me.
The Criminal Justice Act 1988 (Offensive Weapons) Order 1988 specified descriptions of weapons to which section 141 of the Criminal Justice Act 1988 applies. This Order adds a new category of weapon, the disguised knife, to the list of specified weapons contained in the 1988 Order.
[I]. The Schedule to the Criminal Justice Act 1988 (Offensive Weapons) Order 1988[2], which specifies offensive weapons for the purposes of section 141 of the Criminal Justice Act 1988, shall be amended by the insertion into paragraph 1 of that Schedule after sub-paragraph (n) the words -
"a disguised knife, that is any knife which has a concealed blade or concealed sharp point and is designed to appear to be an everyday object of a kind commonly carried on the person or in a handbag[/B], briefcase, or other hand luggage (such as a comb, brush, writing instrument, cigarette lighter, key, lipstick or telephone)"