Royal Mail and The Trading Standards Office are warning about a particularly expensive scam.
A card is posted through the door from a company called PDS (Parcel Delivery Service) suggesting they are unable to deliver a parcel and that you need to contact them on a premium rate number (an 0906 number, probably). If you call that number, you will hear a recorded message and you will have been billed for £315 for the call.
If you do receive a card with these details, you are asked to contact Royal Mail Fraud on 020 7239 6655. This information was provided to WBRA by the Metropolitan Police.
LB Bromley also has information about scams and how to detect and avoid them on http://www.bromley.gov.uk/scams.