From Sandy, sorry I couldn't copy the clever pictures!
Our house pay for permit parking because it lets us park close to our house which helps as both of us have health problems and accept that to do this will cost us each year.
I understand the frustration many residents feel about permit parking and they way it pushes those that don't have or will not pay for a permit to move to non permit streets. For years we suffered from that very problem and even asked the council if we could pay for permit parking on a near by street to which they said no. If permit parking was removed from our street then we would once again be forced to park up the side streets taking one of the locals parking space. It seems that no matter what way this is viewed, someone will lose out. I also accept though, that permit parking is part of living in a big city like London and not likely to change.