I had a query the other day about the availability of a postcoding
service from South Wales Police. I contacted them only to be advised
that this service is discontinued. However, the officer responsible
for this area of crime prevention was extremely helpful. As a result
of the conversation, I'm able to report the following:

* they're going to send me a set of marker pens, including some kind
of invisible UV marker, which I'll bring along to the next meeting,
provided they arrive in time.
* there's a service called www.immobilise.com on which you can
register your bike's serial number (normally stamped below bottom
bracket). South Wales Police are now using this to trace the owners of
recovered goods.
* the crime prevention team seem very keen to talk about issues such
as parking, lockers, and cycle training. In fact, the officer that I
spoke to went so far as to suggest he and his colleagues came along as
guest speakers to a future meeting -- I didn't even have to ask.

I think this is all very positive.
Nick