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Combine an Freedom of Information request for all documentation held by the council relating to the land , the development of the land and any flooding related matters with a threat to seek judicial review by the courts of the decision of the local council to proceed.
For good measure you can throw in a complaint to the Local Authority Ombudsman if you wish.
The honest answer is that successful action against individuals is unlikely because liability relies generally on a contract or liability in tort which only extends to certain situations.
In the public arena the penalty is usually loss of office/employment.