I'm confused. Cameras film on private property all the time in the States. I used to have a job that took me all over the city I once lived in. I'd encounter many notices informing one and all that they were being filmed. I'd always smile and flip the camera the bird.
American cities are taking to filming public areas 24/7, as well. Recently I watched a segment on the local news where a major city to south of me was boasting about the number of cameras now filming the town full time. It sounded Orwellian to me.
BTW, RK, the TV segment showed a number of downtown business establishments which could easily be recognized on the videocams - back doors AND front doors. So what makes the Brits so much more terrible than us?