Ask the chief executive of any of the big six energy suppliers what keeps them awake at night, and expect to hear the word "trust". Energy companies are routinely vilified in the national media and in Whitehall, so it is no surprise that survey after survey shows they continue to plummet in the public's estimation. In just the past fortnight, we published exclusive research carried out for us by Alva which showed the reputation of the energy industry lags behind banking, mining and insurance.