http://www.scouts.org.uk/news/225/scouting-refutes-knife-ban-claims
I became a Scout in 1967 and wore a sheath knife to meetings. This entailed walking or cycling thro urban streets. Later in life, as a Troop Leader, Venture Leader, GSL and ADC(LT) over the years, I never saw any reason why it was necessary to carry a sheath knife at camp and found it far easier to carry and use a folder. If nothing else, it set a powerful example to the yp/children/Scouts as we had a mutally agreed "local (District) rule" against sheath knives being used by them, under any circumstances. Folders were, of course, allowed under appropriate circumstances.
There were very good reasons for that, given the area we operated in, one with very significant social issues and where "knife culture" was a significant social problem.
Although no longer in the Movement, I still don't use a sheath knife in my outdoor activities. That said, that's my personal choice and while I recognise the value and practicality of such a tool I've yet to find anything my folder can't do that my sheath knife can do better.
Much will come down to the quality of training in safe knife usage and sadly there are still too many Scouters who want to carry machetes or "rambo knives" on their belts. That this may serve some purpose for them, either practically or to fulfill some personal ego need is a little difficult when they are also serving as role models for Scouts, many of whom will possibly seek to emulate people they admire and respect.
All that said, if yp are taught the safe use of a knife in Scouts, that knowledge will quite probably stay with them for the rest of their lives and I'm delighted to see the Movement taking a sensible and realistic line. Scouting without being able to use a knife is not Scouting.
Mike.