Don't trust anyone. That should be the message to everyone answering the door to strangers.

A couple at Blackbird Leys, Oxford, have become the latest victims of con merchants, losing £1,000 to bogus police officers they let into their home.

We have lost count of the number of times we have published warnings about doorstep conmen, but these criminals still find a lucrative market.

Keep that door firmly shut until you are completely satisfied that callers are genuine.