How much should governments spend on cycling/walking?

no point in having the money if we haven't the knowledge and infrastructure to build the infrastructure

I think many people here do have the knowledge though you are right about the infrastructure which should demonstrate political will. So the infrastructure required may well be the appointment of a ministerial department responsible solely for walking and cycling.

The Cycling and walking investment strategy (CWIS) is a small step with a small budget but perhaps a potential to begin building govorment infrastructure (to build the infrastructure, so to speak)