This was a non-starter regardless of how visible the kerb was. An occupier is entitled to assume that someone entering in the course of their employment accepts risks incidental to that employment; that's why the firemen can't claim if part of my building collapses when they attend, nor the roofer complain if the roof's tiles fall on him.
This policewoman had a torch with her. It's part of her standard equipment. If the light was insufficient, she should have used it. The occupier says that the kerb was lit by a street light a few yards away and by the lights of the forecourt.
No win, no fee, strikes again.