That's just crazy - over here you call BT's Malicious Calls Bureau and they instantly add the service to your account, then when the number calls again you hang up then dial 14258** and it's blocked.

The amount of hassle to actually get the calls stopped is probably about the same (paperwork, police that care etc..) and you are just as unlikely to get their name/address, but the physical problem would be sorted.

Gareth