I must say, as an adult in the habit of carrying a lockback folding knife whenever I leave the house, a practice I ultimately owe to Lord Baden-Powell, I found it.. discomfiting that this benign practice is illegal in London. Lovely city in general, one of my very favourites, but there's something grim about that.

"Be Prepared" was considered a perfectly valid reason at one time. Still is in hmm. Many places.