
Yes do pass it on to the police. They do investigate these scams as some people do actually believe them....
A new scam is apparently doing the rounds the email or letter says that you have been over paid working tax credits and need to pay several hundred pounds immediately. I got one on my email recently asking me to pay back working tax credit over paid to me for my children... (my kids are 32, 30 and 28 so I thnk they might be a little late).
Another scam I heard about a couple of days ago involves a telephone scam, somebody rings you tells you they work for BT and you will be cut off unless you give your credit card details to the caller to pay a debt you owe BT. They say they can cut you off, but even though you can't hear them or dial out you are not cut off.
I always check with snopes.com if I get a letter or email which I am suspicious about.