Classic fraud. You will get visitations from private investigators/bailiffs/police if this continues. Mark every item other than obvious junk, "addressee moved 06/07" and put into a post box.I moved into my flat back in june this year, and was getting mail quite regularly for the previous occupants. I left this in the mailbox (downstairs) and it was collected usually every few days.
However, its now getting silly and im getting insurance renewals, new credit cards, bank statements, letters from the dvla etc and its quite tiresome.