[xoxoxoBruce]

Well they really only have to ask why a person is going somewhere. They can check the CCTV records to find out where they've been since they got up in the morning.

I wonder what you are supposed to do when they take your car and papers "away" for examination? Stand and wait? Go home and wait? Go to the Police station and wait?

Hmmm...rereading that, it doesn't say papers, it says documents. I guess anything encrypted or looks like it could be some kind of code... even something in a foreign language would suspect.
Keeping a paper record of a running cribbage game could bring a raft of shit. Better back up your documents.

Realistically, they won't be stopping everyone on the street with a lot of questions. But that won't be much consolation to anyone that gets on the wrong side of the local constabulary.