The car park people, those nice but dim folk at NCP, have decided that re-doing the car park lines and flow of traffic.
In doing this they've reduced the overall number of spaces available. Clearly a winning strategy when, on a regular basis, demand exceeds availability.
The other thing they've done is to paint arrows to direct traffic flow where previously there was no direction.
I've illustrated this below. The red arrows are the direction in which traffic travels when it arrives at the car park and the black arrows indicate the new arrows painted on the tarmac.