The other get out for telephone contact is that people conducting surveys are allowed to call (I guess as the political party making the rules conducts political surveys didn't want themselves shut out).
Isn't it something like "surveys by registered marketing companies"?
I admit that I wasn't paying much attention to what they were saying, I was more interested in giving some poor droid earache by slamming down the phone as hard as possible. Grrrrrrr.