10th Report of Session 2016-17 - published 14 December 2016 - HL Paper 82

Government’s home affairs spokesman in Lords suggests it is unclear how EU citizens’ immigration status would be affected by vote to leave.

It has been claimed that the 1969 Vienna Convention would protect ‘acquired rights’ for estimated half a million Britons in France - but can this be relied on?

"The evidence we received makes very clear that the doctrine of acquired rights under public international law will provide little, if any, effective protection for former EU rights once the UK withdraws from the EU." - Conclusion to Ch. 6