(Telecompaper) BT has announced reported revenue of GBP 17.25 billion and adjusted revenue of GBP 17.19 billion for the nine months to 31 December 2019, both down 2 percent on the effects of regulation, competition and legacy product declines. The company also warned that the recent government decision on the use of certain network vendors would cost the company around GBP 500 million over five years.