Its because its hilly -you need to park that way

This car is not facing the wrong way down the one way stretch of Nugent Hill because it has driven down the hill and past the no-entry signs. That would be illegal.

The driver would have reversed up from Arley Hill. Why? Because on a steep hill -and this is a steep hill- it is easier to hill start pointing down the hill than up.
Of course, when they do start their car they will now be facing the wrong way. A detail.