I experienced an LTN in Dulwich yesterday (living in zone 6, we don't acknowledge the existence of anything that doesn't arrive in a car), a junction that now hosted a band, playing kids, and generally lots of people frequenting local shops and cafes, as opposed to just driving through. I couldn't help but notice all the signs had been vandalized at some point. People really are a bit mad, it seems a brilliant concept.
Noted all those anti-LTN signs, more typically than not outside houses with an oversized SUV in the garden. They want to stop the 'traffic displacement,' I guess the idea is that it's OK to drive down someone else's street, just not theirs, OK.