On Tue, 6 Mar 2007 21:36:45 +0000 (UTC), Mike Bristow wrote:

I suggest you register it unless you suffer from paranoia. The police
and similar authorities have access to any records about you that TfL
maintains.

Erm, surely that's a reason *not* to register it?

Not really. If the police start asking questions in a /really/
serious manner, they'll take you into custody. At which point
the custody sgt will catalogue the items in your possesion,
including the unregistered oyster in your pocket.

Well, yes, that's one scenario where not registering it doesn't help.
But it does stop anyone with access to the system saying to themselves
"Hmmm, wonder what Mike Bristow has been up to lately..." types in
name click click "Ah, here we have his every movement for the
last 2 years" (etc)