Re: Knife & Light pics.
So if a knife is capable of being flicked open it's still okay then? That would be good news, as it's a bit easier to find knives with a stud, hole or lever these days.
No.
Anything that would scare the civilians in the UK will get you looked at very closely. (Most likely by the "1984"-style cameras dotting the area in London.)
There's the "Good reason" clause for carrying a fixed blade or folder with a lock. But keep in mind that the officer you encounter is the one who'll decide whether or not your good reason is good enough not to arrest you.
Even if your knife is technically legal, you could encounter problems. While both a non-locking SAK and a Spyderco UK penknife are legal to carry, it's no secret that officers in England have a very negative attitude towards Sal's street-legal Spyderco. To avoid hassles a SAK is better.
The knife pictured above is a good alternative to a locking folder, but don't bring unwanted attention to yourself by flicking the blade open.