You gave up some sovereignty when you joined the EU ?
Just like Germany whom also complained about the ECI ruling(s) ????
Which ECJ Ruling is the UK and yourself against and why ?
I was not personally motivated to vote Leave by any particular ruling. What needs to be understood
is that its rulings are taken as precedents which lower e.g. UK courts feel constrained to try to follow.
So once the ECJ has established that a legal individual can sue a government for not following an EU directive,
a whole range of litigation opportunities are opened up. Example 1: Individuals can sue the UK government
because air pollution levels in London are exceeded. This is largely due to VW and others cheating on emissions.
It could be resolved by banning all VW and other such overtly over polluting vehicles from being driven, but no doubt
that would result in aggrieved individuals and VW sueing the UK at the ECJ on the grounds that it was constraining trade.
Example 2: Companies can sue the government on procedural grounds (e.g. if they fail to win a contract).
So government bodies are diverted from doing what is needed efficiently to reducing the possibility of litigation.
A problem with supreme courts in that sooner or later they assume their role, never mind the legislature, is to invent law.
We have already had that in the UK e.g. with judicial review which unreasonably constrains discretion, and having yet
another court invent law further undermines the democratic process.