Full disclosure, I don't own a car and never have. Although I passed the driving test many years ago I quickly decided that it wasn't for me.
Being a grandparent has made me more aware of the pavement parking issue, trying to navigate a pushchair along the pavement is a real obstacle course, often having to go into the roadway to get past a vehicle. I've also noticed people in invalid carriages / wheelchairs facing the stark choice. This is, of course in addition to the people who's time is so precious that they feel the need to pavement park / double yellow line while they pop to the shop / bank /cash machine and seem oblivious to the inconvenience to others. ( and there's never a Parking Enforcement Officer about when you'd like to see them taken to task.)
Having mused on this I came up with the ideal solution for the digital age, and being the altruistic person that I am I am foregoing my intellectual rights to the idea and offering it free of charge for the benefit of society.
The proposed solution would be a smartphone App which, for example, could be named " Dobber", and this is how it could work: It would be a nationwide app ( with the possibility of " going global" ) with each local council running it autonomously. Local residents who are on the Council Tax register would download the app, and when they see a vehicle that is illegally parked they open the App and take a photo of the offending vehicle. This is cryptographically signed to assure authenticity of date, time and location. The photo is automatically uploaded to the council parking enforcement department . They would issue an automatic fine ( amount to be determined by the council) giving the offending party 30 days to pay. Ten percent of the fine is then credited against the annual council tax bill of the person uploading the photo.
There'd be a social aspect to it as well, with people meeting up to go " Dobbing " , perhaps there could be local league tables with councils having an annual " Dobber of the Year " award, with a national ceremony to be held at a suitably prestigious location in London.