I would be curious if there have been any pen testing against the police and municipal camera networks in the UK. I wonder how many of the vulnerabilities of the system in the video come from trying to use WiFi to save on costs of hardwired setups.

We've had them for a long time. In the London the "ring of steel" was installed as a result of the IRAs mainland bombing campaign in the 80s and of course has expanded as the various congestion and clean air zones have been rolled out. I doubt it would be politically possible to remove them now. While potential leaks are an issue at least public sector organisations have some degree of accountability for the cock ups.