clipped from: news.bbc.co.uk John Catt found himself on the wrong side of the ANPR system. He regularly attends anti-war demonstrations outside a factory in Brighton, his home town.
It was at one of these protests that Sussex police put a "marker" on his car. That meant he was added to a "hotlist".
This is a system meant for criminals but John Catt has not been convicted of anything and on a trip to London, the pensioner found himself pulled over by an anti-terror unit.
"I was threatened under the Terrorist Act. I had to answer every question they put to me, and if there were any questions I would refuse to answer, I would be arrested. I thought to myself, what kind of world are we living in?"
Sussex police would not talk about the case.