Looks like Wigan Metro are doing their job as I am not on it, but an old girlfriend who owes me some money is! 
  Having said that I have also registered with the Mail Preference Service, takes about 3 months to kick in but then it becomes an offence to send junk mail to your address.   
http://www.gov.im/dlge/waste/tips/home/junkmail.xml  There is one for unwanted calls also.