Re: So, to sum up. . .
"To state that "Parliament does not negotiate with foreign governments" is wilfully misrepresenting normal relations with other countries as adversarial."
I'm sorry, but you've missed the point entirely.
Parliament literally does not negotiate with foreign governments. Foreign parliaments do not negotiate with foreign governments. Parliament is the legislative branch of the UK government (like congress in the USA). Congress does not directly negotiate with other countries, that's an executive function under POTUS, State or Defence depending on how kinetic the negotiation is.
In the UK the government is formed by the party with the support of the majority of Parliament. The government is the executive branch, and does things like negotiate with other governments, make treaties, fight wars. Usually declaring wars is part of the legislative branch, along with writing laws and raising taxes. Which are pretty much the definition of sovereign.
Much of the insanity of Brexit has been the lengths that the government has gone to keep Parliament away from the business end of things, and how willing certain MPs have been to let them have the rope in the hope that the mass hangings will lead to a socialist paradise in Islington.
TL&DR: Parliament doesn't negotiate with foreign governments in the same way you don't bury the survivors of a plane crash.
Biting the hand that feeds IT
