...or taking them to somewhere where you are legitimately going to use them for a legal purpose, or taking them back from there, or, indeed, doing anything else with them for which there is a legal justification. Provided the knife is securely packaged (in a toolbox, for example) and not available for use as a weapon, it's all good.

Note that all this refers to big knives, not pocket knives with short blades, which are still completely legal to carry on you without needing any justification.

Seems very reasonable to me. As a result, contrary to the myths, and in spite of guns not being available for attacks, we actually have a fairly low rate of actual knife murder; slightly less than that of the US, I believe.