The logical consequence of devaluing International Law, or at least the UK's position on it, should also be obvious: we lose any and all authority we had when complaining about the violations of other nations. How can we complain if and when Iran reneges on that Nuclear deal, the JCPA? It would, after all, be acting in its own interest. I don't want to overdo the examples, but it should be obvious that if the UK undermines the principle that International Law should be respected then that hands further licence to less desirable states to act with impunity in the same spirit.
I also resent, once again, the implication that this is in any sense anti-British. It is quite the opposite. After all, what I am saying is that, actin gin this way, the UK loses the moral high ground -- which means that I believed we held this. I don't know how much more pro-British you can get than saying that the UK can be proud of how it typically conducts itself on the international stage, and that it should stick to those same high standards.
"When the Queen’s minister gives his word, on her behalf, it should be axiomatic that he will keep it, even if the consequences are unpalatable. By doing so he pledges the faith, honour and credit of this nation and it diminishes the standing and reputation of Britain in the world if it should be seen to be otherwise. No British minister should solemnly undertake to observe treaty obligations with his fingers crossed behind his back."
(Geoffrey Cox QC MP, The Times, yesterday)