[blazey]

I remember that they had warnings in the charity shop windows about it the other year.

Of course, this scam may not be still going, but others can be easily set up, so maybe you should just not call any mysterious numbers EVER just to be on the safe side, regardless of the code. Turn your answerphone on and dont even dial back numbers u dont recognise if they havent left a message, scams can also work in similar ways over the phone, getting people to call back premium rate numbers, which i believe is actually more common than postal scams and also just as likely, if not more, to succeed for the scammer.