Southern are obviously targeting this area at the moment. I had a visit from one of their representatives one evening last week, courtesy of another resident who let them into our block of flats otherwise energy/phone/tv suppliers don't usually get past my entry phone. I was a little surprised how much information they had on me considering I have never been a customer of theirs. They also told me that I was overpaying but like nevermodern I have never come across them whenever I've checked my usage on comparison websites. In the end I told them I don't agree with doorstep selling and I wasn't interested in discussing any further!