@ICouldHaveCheckedFirst
BJ doesn't care that it's an International Treaty. If he wants to change it, he'll find a way.
...
The Uk is not sufficiently powerful any more to break international treaties and get away with it
(The USA, Russia, China can)
However, BJ's attempts could badly hurt the UK, with trade sanctions, proceedings at the Hague etc
Welcome to becoming a rogue state
Decades spent building up a national reputation for being law-abiding, all to be flushed down the toilet in BJ's petulant attempt to get out from under an international treaty that he and his chums didn't bother reading before ratifying.