Mail order business is big business. UK consumers generated over £25 billion worth of postal sales each year but not everyone wants the postal offers.
Recycling your unwanted paper mailings is great but you can stop them arriving in the first place by registering with the Mailing Preference Service. The offer an online registration which is completely free. The idea is that reputable mailing companies will check with their list BEFORE they send out their mail.
It won’t stop every piece of junk mail, as not all companies check with this service, but a lot do and it does work. http://www.mpsonline.org.uk/
Alternatively, open the unwanted mail, stuff everything, including the old envelope and enclosures, in the pre-paid envelope that is undoubtedly enclosed. Clearly cross out your address and request be be taken off the mailinglist! Very satisfying and effective. I am speaking from personal experience. [A]