Labour Leader Sir Keir Starmer calls on the government to introduce a windfall tax on profiting energy companies and use those excess profits to cut down energy bills by up to £600 for those that need it most. He speaks on a visit to a Sainsbury's supermarket in London. <br /> Report by Brooksl. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn
