The chair of the Office for Budget Responsibility says the chancellor still has £9 billion in headroom after announcing a 2p National Insurance tax cut in his Budget. Richard Hughes adds the OBR has revised projected net migration figures to 315,000 a year, despite the government's promises to cut the number. Report by Brooksl. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn