Iain Duncan Smith tells us he's saved £50 billion pounds, but the IFS says no he hasn't!

http://www.dailymail.co.uk/news/article-2938797/My-welfare-reforms-save-taxpayer-50billion-says-Iain-Duncan-Smith-Welfare-grows-slowest-rate-reforms.html social security spending will be no lower next year than it was when David Cameron took office