If you want to see footage of actual littering rather than a still of the aftermath (i.e. proper CCTV rather than circumstantial evidence) ...check out SW60 JUC
I followed this driver for many miles and as an experienced driving instructor, I have to say I wonder if I could do his job. He could almost certainly do mine
It's a still photograph and therefore we can not say for sure that the driver/passengers who own the vehicle were the ones responsible for the litter. Whilst the photograph does indicate this to be the case, there is a distinct possibility that they parked in a parking bay which had litter around it already. A still photograph like this results in people speculating the events.
Unless you provide definitive proof and witness statements, nothing will happen here. Nothing.