The Department of Economic development has refused to answer more questions about the cost of the TT and Festival of Motorcycling.
Earlier this week, it said commercial confidentiality prevents it from giving details about the cost of facilities in Noble's Park.
But after a new Freedom of Information request, the department says it can't reveal how much three rescue helicopters cost.
It also says releasing the price of signs, straw bales and safety equipment as well as roads closed barriers around the course could prevent it getting a value-for-money deal in future.
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