In January Marr asked Cameron if he would give Conservative ministers the freedom to campaign for Britain to leave the EU in the propose referendum.
Cameron replied:
Well, there are Conservative Members of Parliament who want the leave the European Union come what may, but if you’re part of the government, then clearly you’re part of the team that is aiming for the renegotiation.
Marr then asked for clarification. “So you’re not going to do a free vote, as Labour did in the 1970s?”
Cameron repled:
No, I’ve set out that very clearly in the past.'
http://news.bbc.co.uk/1/shared/bsp/hi/pdfs/09012015.pdf