This one...
It seems to be the most common arrangement in the UK.
It's simple and has stood the test of time.
I did a Google search and stumbled across an academic paper that resorts to the most byzantine of maths to prove a point that everyone knows*.
It's the second link down (Optimisation of Car Park Designs) if you're really that interested. Or bored enough.
Link
*We're back to common sense again. See above.
