They have to decide whether to go to the European Court, which has a time limit from when they receive the formal documents from the court of the decision, or start civil action. They have up to 6 years after the date of the transactions they feel financially disadvantaged them, or they become time barred. If they decide to go to the European Court, they have to ask leave to appeal to that court. Their last case never got that far. But, should they go ahead with that, then the 6 years for civil action will be up.
One thing I seriously doubt that they will is 'give up all the legals'.