I live and work in London, and I'm more likely to be caught on about 500+ cameras per day.
Let's see:
All numbers are rough estimates:
In the morning, I walk to the bus stop on my high road. There's 3+ street cameras on the corner, plus 5+ more cameras further down the road (in both directions), plus 3+ cameras in the 2 shops I walk past. (total maybe 15+ form my home to bus stop, 5 mins walk)
These shop cameras are mainly focussed on the shop floor, but also catch people walking past in the shop window.
On the bus, there's about 9+ cameras. (in the tiny black domes on the roof).
While walking and waiting, about 6+ buses passed, and I was filmed by their bus-lane cameras, and their door cameras. Let's say 12+ cameras.
I transfer to the tube, with another 10+ cameras around the tube entrance, plus several more buses passing (6+).
Walking down to the platform, there's 10+ on my route through the tunnels, and another 10+ on the platform, and several in my tube carriage.
Change tubes, walk down 2 platforms and an intersection. 30+
Out of the tube, another 20+ in the station tunnel and platform, and 10+ at the entrance. I cross the road past a congestion charge checkpoint, another 20+ in all directions. Yes these are traffic cameras, but they still pick me up.
At lunch, I walk down the high road for a roll, 20+ cameras.
Same again going home.
Go out shopping after work, walk past maybe 20 shops, (40+) and another stretch of high road,(30+), and same again coming back home.
Out in the evening to somewhere in Central London, repeat the travel camera count, plus West End camera count, and then same again back home. Maybe another 200+?
I've completely lost count by now, and this is just a slashdot post, but already I'm nudging 500 + and that's without going for a car drive into London or a taxi ride.
Damn, I'm scaring myself now.
And yes, I've seen so many times 'Oh we couldn't find the tapes' whenever the police beat someone up, including witnessing a couple of events where the police just steamed into some people peacefully drinking in a pub at 6pm.
Other major cities in UK are less heavily surveilled, but they still have cameras on buses etc. So I can see how the average is driven up for rural people. (I grew up in Cornwall, and there's a lot of cameras on the larger roads and in the larger towns there now. 'Larger town' in this context actually means a village of 1000+ people)