We've driven around London. Never again :) Do like the train, though.
That is a PARKING issue and a road issue. For example driving in Athens is a major problem because the city layout was disigned 5000 years ago. There is next to no parking and streets that were made with animals in mind rather than automobiles.
In the USA we have a luxury of being able to design for automobiles. The problem in Europe is that until recent history they were not mandating designing with parking in mind.