Personally I think that bit is wrong. Ive been pulled for a plate that is perfectly legible by ANPR, but a slight spacing change. No screws, tape or other alterations just one character moved by 15mm so its closer to the last three letters than the first one. If the plate is legible, detectable by ANPR and on a car that is hardly going to be used if you wish to avoid attention/detection (bright yellow 350z), then why the ticket.
Its for the stats. Crime detected, Crime resolved.
I know they exist, the police know they exist, everyone knows they exist. And when the regional force is looking like they may need a bit of a boost to make sure they exceed their targets - the motorists will know they exist too.
Im also afraid that the "no pay rises for the public sector" may increase this sort of activity too, as bonuses will no doubt be rife in order to circumvent the no pay rise policy. Which means those targets will need exceeding by a good margin.
My advice is to ensure your cars are sqeuaky clean, as we could see a period of trivial offences being ticketed every time. Of course this will be publicised as a "zero tolerance campaign" or a "crackdown to prevent an epidemic" etc etc. The authorities must think us general public have three heads and are the result of cousins marrying.
Didn't you vote the public sector pay freezers in?