Lock bumping makes a noise, if one is inside one would hear it, but traditional lock picking with picking rakes is nearly as fast and probably as fast or even faster with the more skilled operators, but more importantly, it is far quieter. So locks aside from some of the mentioned makes and others, trust no lock to keep yourselves or your valuables safe, for everything security can be overcome if someone wants in for good enough reason to make it worth their while and risk of discovery.
I had an expensive U lock made from boron steel, where it is claimed it would takle so long to cut through it or even bend the shackle to break the lock, but doing that it would break the bike frame first as even bog standard chromo is weaker than boron steel, so what's the point attempting only to end up a knackered bike. But that U lock that cost me near on £50 even I managed to compromise the lock with a couple of hair grips, (us long hair types have plenty pof them about). Now it took me ten minutes, but that was my first attempt after watching a Youtube Tutorial, and I am not doing this to profit, I was doing this to see how secure my expensive and heavy U lock was, I was appalled.
Now what occurs to me is people with the more expensive bikes will go for the so called better locks, anyway those that boast so much and carry a hefty price tag, and so all a criminal has to do is clue up on a few different locks then go looking and hey presto they could be bumping the lock in seconds. Further to that, how many people does one see carrying bolt croppers around with them, it's simple, it is the locks being bumped.
My Saracen had a n expensive Magnum lock on it, it still got stolen.
The key of course bearing in mind no lock is secure, is to slow down a would be thief, or make them make a noise and so attract attention, as to whether people in the UK could care less is another question.
Mind reading up on mortise locks there are some pretty nifty medieval designs, locks with booby traps that cut fingers off or trap fingers so thieves are caught red handed, and probably red handed too.
