Millions of Brits are grappling with rocketing energy bills this winter, as Ofgem's price cap jumped up by roughly 10% in October. But money experts suggest there is one surprising thing you can do to lessen this blow - and it may cost as little as £15. You may be surprised to hear that such a solution involves placing a camera in different parts of the home. But not just any type of camera - one that monitors temperature variations, according to consumer champion, Which? . Senior Which?