I've just had a called from 'Crime Prevention UK', claiming to be an organisation set up by the government (or something like that) and working together with the local police to improve home security.

Another scam of course; they offer you a 'free' burglar alarm which they then charge you to fit.

This blogger has done some research:

http://www.maryreid.org.uk/blog/?q=node/239

So many scams, so little time to record them all.