A warning received via Neighbourhood Watch:

Information received indicates that letters from the International Fifa World Cup Online Lottery are being delivered in Brentwood. These may soon be received in other areas. These letters are mainly being sent to elderly people, and are saying that the person has won a large sum of money and that to receive the money they are to fax over their bank details to the following fax number 020 7681 1447. This appears to be a scam.

Never give out your bank details to anyone, without checking to ensure that the recipient is bona fide.