You should report it Scooby, tell them the time and date the photo was taken and they will have to look into it.
Unless they have been responding to an emergency where that was the first nearest available parking space, then they are not allowed to park there.
Mind you, most of the people that park in disabled spaces dont seem to have badges (or at least dont display them) nowadays, its disgraceful, but then the police should be setting an example.
I seen a copper the other day go flying past me at about 50 in a 30 limit, no blue lights and no siren. Also a few weeks ago, I was at the Upton village crossroad junction, and a piece of bacon turned his lights and siren on as the lights changed green and then as soon as we had all let him through, they went off...
Sometimes they are terrible. But then imagine life without them.