The treaty which mandates the adoption of the euro and the reason new members need to adopt it specifically says the UK and Denmark are exempt form said adoption with nothing about leaving and rejoining because it was just not expected when the treaty was written.
Obviously the EU would need to be OK with the UK not accepting the euro otherwise it could reject the application or even amend out said previous of the treaty, but if they did accept it they would just need to say the currently inactive provision of said treaty would become active again.
You are not wrong in that currently the treaties still have that language in them, because there was no need for the member countries to go through the treaty amendment process to change something that has no effect.
However when the UK inevitably rejoins, there will be a amendment process that applies the new negotiated terms, and the language that formalized the former uk opt-outs wont stay there. Since theres not a institution on the planet that is that incompetent to just forget about them. And there is a 0% chance that it currently being there would have any influence on the negotiations.
If the UK wants to join the EU, it needs to negotiate in good faith. And that wont get it anywhere.
As i mentioned in my comment it would only be possible if the EU was willing to allow it. However I disagree it would have zero impact on any future negotiations simply due to how it makes the optics of any potential UK Euro opt out much better for the EU, as it already exists in said treaty both sides can agree behind closed doors it comes back into effect, where as if it did not then the EU side would need to pass legistaion/amdendments to grant said opt out opening up such a move for a greater degree of critisim.
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u/stupid_rabbit_ United Kingdom May 14 '25
The treaty which mandates the adoption of the euro and the reason new members need to adopt it specifically says the UK and Denmark are exempt form said adoption with nothing about leaving and rejoining because it was just not expected when the treaty was written. Obviously the EU would need to be OK with the UK not accepting the euro otherwise it could reject the application or even amend out said previous of the treaty, but if they did accept it they would just need to say the currently inactive provision of said treaty would become active again.