Earlier quoted context omitted.
The accepted solution is to have a constitution that says otherwise. Which is a bit complicated here, as the EU has no real constitution and this 'law' (really a regulation) is a blatant violation of the constitutions of countries that did choose to establish secrecy of correspondence.
isn't constitution easily changed by parlament?
https://en.m.wikipedia.org/wiki/Twenty-eighth_Amendment_of_t...
Only 59% turn out, and the vote won 67%. So in reality less than 40% of the population were for it.
I have vague memories of people saying that the treaty was indecipherable. The EU were like, "Here, vote yes for this big bag of 'misc', or else"
This wasn't the first time they reran a referendum for an EU treaty. They did it back in 2003!
https://en.m.wikipedia.org/wiki/Twenty-sixth_Amendment_of_th...
If the UK wanted to avoid BREXIT all they had to do was look a few miles to the west for the knack.