Found this on another forum.
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If it just says 'the occupier' withiout your address, then it has been put through your door by the postman. The post office make a lot of money by delivering leaflets, You can speak to the PO and they will take you off their distribution list.
If its 'To the occupier' with it your addrress on it, then it's probably a mail shot. You need to register with these people:
http://www.mpsonline.org.uk/mpsr/
they ared the Mail Preference Service. If you register with them, it stops direct mailers sending stuff to your address.