This article about downtown parking charges forcing people to park in local neighborhoods proves everything I have been saying about on street parking charges. They do alter people’s parking behavior. Now, by enforcing the rules in neighborhoods around the center city, my guess is that the cheap of street garages will be filled and the problems solved.
They could, of course, go even further and charge for parking in the neighborhoods, but who has the political will to do that, particularly in the UK.
The last line says it all. Their cheap garages are empty because people can find free parking elsewhere.
JVH