Re: 12 million custody photographs
So you're saying that 20% of the population has committed at least one arrestable offence, and been arrested for it?
What proportion of such offences go unreported, or have no arrests made in connection with them?
Seems to me that if that many of the population are criminals, maybe the definition of "crime" needs some rethinking. Or maybe your arrest policies do.
The UK plod used to be some of the finest in the world. Not sure when that changed, possibly the miners' strike of 1984 had something to do with it, but we've come a long way since then.