I think this is potentially a good exercise, and I wish someone responsible had done this about three years ago!
But (at risk of going off on a tangent) I think one of the areas where the whole debate failed was this focus on 'up/downsides to the UK'. Most of my arguments on the EU issue have always been rooted some sort of absolute (and abstract) 'right thing to do', not just narrow UK self interest. And I think the Remain campaign made a big mistake by essentially campaigning on 'you will be worse off'. The best argument for Remain, to me (notably promoted by Eddie Izzard) was that "The EU is a bit cråp, and probably a bit bad for the UK on balance, but it is good for Europe in general, and so it is our duty to join in and make it work a bit better." (See School Governors thread - it's a pain in the donkey, but a valuable service.)
So on 'Free Movement', I think it is immoral and unwise to have free movement of labour across the EU,
even though I think it is largely beneficial to the UK, as it has negative effects on
Eastern Europe:
- it denudes those countries of many of their best people (many confident, energetic and skilled people come to work in the West)
- it is parasitical on the education and training investment of those countries, which pay (for example) to train nurses, and then lose them
- it allows some Western European industries to stay based in the West, importing labour from the East, rather than locating their production in the low-wage areas
- it distorts the Eastern economies and societies, making them heavily dependent on remittances (or cash-rich returners), due to people working in the West