America is so much better than the UK at dishing out stiffer fines and penalties to fraudsters. [this also includes the total retribution on the Big Banks that steal from the unsuspecting and gullable citizens of the USA].
and say that you do not wish to receive any un-addressed mail. That won't stop clever senders who address to 'the occupier' but it will reduce the volume considerably.
You can also write to anyone who sends you unwanted mail and tell them that under the provisions of the data protection act 1968 you require them to cease processing personal information for direct marketing purposes within 28 days, or you will apply to a court for an order under said act.