In small and medium shops, cameras are there to provide evidence to the police after something has happened or so the shopkeeper can see the back of the store. No analysts are required.
In bigger shops, and police/council networks, 1 person may be in charge of upwards of 20 cameras.
Not only is it not logistically impossible to have millions of cameras in the UK, but even the
CCTV User Group says there's more than 1.5 million not including corner shops. All the takeaways on my road have at least 2, one corner shop has 3 and the other has at least 5. Those numbers add up.
As for the comment that anyone who doesn't want cameras everywhere has never lived in a bad neighbourhood, being mugged once when you were 9 in an "upper middle class" area is classed as bad? Personally, I've been stabbed, beaten with a baseball bat and seen my block of flats set on fire in the past few years. This area is nowhere near as bad as where I grew up. There, being mugged as a child was a weekly occurence.
Funnily enough though, I still don't like having CCTV record my every move. Maybe it's because CCTV does not prevent crime and is easily defeated with a hood or bandana. Or maybe it's because of the slippery slope. Something happens outside of CCTV coverage, then CCTV must be placed there. Eventually there is not a single inch of private space left in the country.