changes to surveillance law in light of ECJ ruling

The government has launched a consultation into changes to the Investigatory Powers Act that have been proposed in a bid to make the legislation compliant with EU law.

Late last year the European Court of Justice ruled that parts of the act – often informally referred to as the snoopers’ charter – were in contradiction of European law. In response to this, the government has put forward a number of alterations and additions.

These include the proposed establishment of the Office for Communications Data Authorisations, an independent body whose job it will be to authorise – or deny – authorities’ requests to access people’s communications data. The office will be helmed by the UK’s first investigatory powers commissioner, Lord Justice Fulford, who was appointed in September.

https://publictechnology.net/articles/news/government-puts-forward-changes-surveillance-law-light-ecj-ruling

Are we not still under EU law, at this time and who decides after we leave if a EU appeal has not been seen through the EU courts before we leave?
What happens then?????????

Is a case of appeal (that lost in every court in this land and has gone to EU appeal ) still get judjement from EU or does it go back to UK, after brexit and will the UK desision still stand???