Capital Kiwi suggested that The real danger lies in(side) cars with "CR" plates

No argument there, though it is a cool little icon, better than a boring alphanumeric combination. Thanks for the explanation on DC by the way, we seem to have a surprising number come up this way, popping in to catch up with Terence O'Brien perhaps. Either that, or to get blotto on HB wine and laugh at PC plod when he tries to nick them.