So the location is here, if I am correct: -
Find local businesses, view maps and get driving directions in Google Maps.
Obviously parking on the tarmac behind the footway is tolerated, because in the strict legal sense of the 70s legislation, the offence covers up to the property line, which here is the shop front.
The PCN photos are frames from a CCTV camera, and the only way to see it is to request the videeo from TfL which comes as a DVD, (yes TfL are in the IT Dark Ages!). However, requesting this puts about 10 days freeze on enforcement so gives you and us time to see if the TfL video really is showing what it says it is showing. So phone TfL and ask for it.
This is a Red Route, so allows camera enforcement of parking, rather than a CEO serving a PCN to the vehicle. At least that is my understanding. For me, however, it is a purely money-grubbing PCN that serves no traffic management purpose whatsoever.