Mr Pounder Esquire submitted this idea :
http://www.tpsonline.org.uk/tps/index.html
At my old home we were inundated with the paki *******s ring us. Subscribed
and the calls almost stopped.
Took TPS to our new home. We may get two calls per week.

Your old number was obviously on a list and the new number after you
moved, not on the scammers list. My experience of the TPS is that it
makes no difference to those who might choose to ring, in the UK or
from outside the UK.