A clever trick to help cut down on your heating bills involves a common household item you're likely to have in your kitchen. According to Martin Lewis ' Money Saving Expert website, clingfilm could be the key to keeping your home cosy this winter. The Centre for Sustainable Energy suggests covering windows with a thin transparent plastic film, similar to clingfilm, which can be easily installed by yourself. The blog post explains: "It's cheap and simple, and by putting a sheet of specifically