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Whatever Cameron gets in the way of concessions on Europe, there is zero possibility of the rules regarding free movement of labour being changed.
The only concessions he can possibly get are to limit benefits for those entering the UK from the EU. Limiting child benefit, housing benefit...
Interesting article by Robert Peston on the BBC site today
http://www.bbc.co.uk/news/business-34172729
I hadn't realised that Germany's population was falling so fast, and that the UK is set to become Europe's most populous country.