How much do I have to pay for an action against the authorities for failure to act?

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It depends on whether you win or lose the case. If you win the action against the authorities for their failure to act, the authorities have to pay the costs. If not, you will be the one who has to pay. That is why it is a good idea to apply for legal aid beforehand. If legal aid is granted, you do not have to pay the costs, even if you lose the case.