I just reported a call from 0208 0997988. I told them that the barely understandable foreigner said she was doing a survey.
Googling the number indicates it is a bunch of fraudsters after "deposits" to provide a phantom loan. Apparently you pay the deposit to a gentleman in Delhi. Have they found a way to fake the number they are calling from?
I had a reply from TPS saying that surveys are allowed under the terms they operate, so no action will be taken.
So if, say, I ask the question in the title of this post, I can cold call anyone.