Video: Cash for questions: more MPs under investigation as David Cameron's lobbying scandal prediction comes true An undercover investigation conducted by The Telegraph and the BBC's Panorama programme found that the former shadow minister, tabled five questions to Government ministers and put down a parliamentary motion after being paid £4,000 as part of a contract he believed would earn him £24,000 a year. David Cameron warned more than three years ago that lobbying was the "next big scandal waiting to happen" but he has failed to act on the issue, says James Kirkup, as he reveals more MPs were investigated by The Telegraph.