On the subject of free movement and Rog's point on equal economies for it to work, the minimum wage is a good indicator of pro's and cons in this area.
https://en.wikipedia.org/wiki/List_o...y_minimum_wage
I may be wrong, but I'm also pretty sure that minimum wage isn't a term (yet) of EU membership, and I do think that a lot has been made of employment law when I suspect very little will change, as our laws are in the most part more beneficial than EU minimums. Perhaps the working time regs 48 hour week being hit, I can't see much else changing.