Nuisance Calls

[#1]

Since moving my home phone from BT to PN on Monday I have had several marketing or survey calls.
I had put a block on these but assume I will need to do this again.
I understand there are places you can register to stop these calls ant the telephone preference service is one but I seem to recall someone posted a link to another site which blocked calls the telephone preference service could not block, do you know what this link is ?   

[#2]

The only other site that I recall mentioned was for reporting silent calls.
http://www.ukdatait.co.uk/cgi-bin/sgAddNumber.cgi
There is Call Prevention Registry. It claims to block more calls than TPS but charges £39.99 pa.  
http://www.callpreventionregistry.co.uk/telephone-preference-service.html

[#3]

Thanks for that.
The one for silent calls was the one I was looking for.
I Note there are a few who seem to offer to block calls for a fee something I would have thought the phone companies could offer at a small charge.

[#4]

Is this the one you are looking for,it certainly seems to have cut our silent calls
http://www.ukdatait.co.uk/cgi-bin/sgAddNumber.cgi

[#5]

john50 alanf has already posted that link you have given.

[#6]

Sorry didn't read it properly  thought he was still after it