No, they don't. Planing permission typically allows a 4 bed with 2 parking spaces, but one is a garage, meaning it's 1 usable parking space. Given that the only way you can afford a house is to have at least 2 workers, that leaves either 2 cars or public transit. Public transit in the UK is far better than the US but is still not good enough for most people.

With increasing numbers of children staying with their parents past education, you end up with 3 or 4 commuters per house.