1.  If you would like to reduce personally addressed mail, write to register with:

Mailing Preference Service
Freepost 29 LON 20771
London
W1E 02T

This should remove you from approx. 95% of all mailing lists.

2.  If you would like to reduce unaddressed mail (to Occupier), write to:

Door to Door Customer Services
Opt Out Room
130, Wheatstone House
Wheatstone Road
Dorcan
Swindon
Wilts
SN3 5JW