Re: If only..
@druck: maybe you missed the Facts Of Life lesson as applied to migration:
Getting out of a country is easy. "Leaving the UK" is no problem. Likewise, leaving any other country.
The problem is that there has to exist another country that will let you in. And the UK has no power or authority to force them to do that. (At least, not any more. It used to have the authority to grant you automatic entry and rights in 27 other countries, but then some idiots voted to give that up, so here we are.)
Even Hitler was all for Jews leaving Germany. But after a short while, no other country would let them in, and so they were stuck.