Whilst the whole Kensington thing has surprised and shocked many it's won't be a surprise to people who work in the industry. To make real change happen in boroughs you have to start on the inside. This normally means winning hearts and minds of key decision making staff
and councillors and creating heroes if they don't exist. This is before you even think about engaging the public. This doesn't just mean the head of transport planning but everyone from parking enforcement to communications. These people have to buy in to what your doing.
Everyone's jobs will get busier/harder if you do things properly as you make a difference. People notice and then react. People in positions of influence who see this coming and don't like what they see often try and blow schemes out the water before they get anywhere.
This can be through deliberately going slow, mixed messaging or concerns of the impact. Proposals are left to stew whilst more design/engagement is done in the hope the proposal disappears or loses support.
There's lots of reasons from just not wanting the hassle to big politics, mates owning businesses, climate change denial or how the head of transport gets to work but they can all have the same impact on schemes designed for the good of everyone else.
I've used this ted talk from Derek Sivers (that @OutsiderNick showed me) to explain the mission to those about to give it a go. It's ace so I've passed it on to legends trying to make that same seismic change like @hayleylever