there is a a different drving style in london, my wife is form there and she and her father both drive completely differently and act differently when in london.
it seems very much a kill or be killed mentality, and the language as well i still drive like im in the suburbs when in london, leave gaps etc, and yes some people cut in etc, but i've found if you stress about it, the urge to get out and take the breaking bar from the boot and imbed it in someones head would be too great.
even still when i try to keep calm i still find my blood starts to boil after to long in london. i could never live in london, i like the fact i can be doing 70 mph with in 3 minutes of leaving my house.