Twice this week I have been contacted by caller claiming to be from Energyhelpline, 'to conduct a short survey'. I told the caller that I was TPS registered and she rang off immediately. I have emailed Energyhelpline.com which appears UK based, and yet another price comparison site, telling them to desist. I suspect that they will deny knowledge of the calls.
This possible scam (maybe to obtain calls) has also been featured on Martin's Money Tips (not by me), so it seems widespread.
Be careful who you give your details to.
I will post any reply I receive from the (presumably genuine) Energyhelpline.com