Been to the UK several times, and had a couple of conversations with locals and what I thought were kindred spirits...My general impression was leave anything that has a sharpened edge back in the USA. If you had to use anything like a knife ( much less a purpose designed “combat” or survival knife) to defend yourself, your stay in the UK could be much longer than planned and more costly than you could imagine. Anything that smacks of either a defensive or offensive weapon other than a bare fist will get the immediate attention of the authorities. And, you WILL be observed and videotaped. London and even many of the smaller towns are saturated with security cameras. One of the locals related his son ran afoul of the authorities because he used a Stanley retractable blade carpet cutter to open a plastic pack of batteries. This was on the outskirts of London where his son was working on a building renovation project. He had just purchased the batteries, and was having trouble getting them free of the “theft proof” clear plastic pack. He was standing in a open area, no-one else around, and was waiting on a bus to arrive. He remembered he still had the Stanley knife in his pocket having just left his job site where he had been laying carpet. Surveillance camera “observed his being armed with an edged weapon”. Translation: He pulled the knife out of his pocket and opened the batteries, then returned the knife to his pocket. His Dad said police were there within a couple of minutes, detained him overnight, and the legal costs were staggering. He was very worried his son would have a felony-level record that would follow him for the rest of his life. My wife had her eyebrow curler “whatever” (know you’ve seen them, a little clamp- like device with two sicissors-like handles .....no blade anywhere at all) confiscated at Gatwick AP on the way out. The Security Inspector hit a button and there were 3 or 4 Security employees there within seconds. The eyebrow curlers were confiscated and we were questioned. Glad we were early for our departure.
Brits just don’t like anything that cuts or shoots, from my observations. Might be different in other parts, but according to what I heard, it’s not. Be careful.