I thought this was about the placement of those outside the EU not compulsory intake of the French so it's a different issue. As to where people go in the uk if they are refugees I don't know the answer to that.
So it would be alright for the English to instruct the Welsh that they must take in people from outside the UK (and Europe to follow your logic) rather than within it such as the sudden influx of the Ugandan Asians in the 60's? None of them went anywhere except England, Leicester and Bradford to be precise.