Lib Dems leader Sir Ed Davey has called for the Send sector to be given legal protections Get the free Morning Headlines email for news from our reporters across the world Sign up to our free Morning Headlines email Sign up to our free Morning Headlines email Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice Vulnerable children are being treated as "cash cows", the Liberal Democrats have said, as they push for the special