This turbine is located on the wrong side of a B road from the school so the project costs would include a long cable run and the crossing of a B road with necessary traffic management. I know the project also involved excavation and reinstatement of tarmac car park, a network linked energy display system and software/educational resources.
As a scheme supported by the LCBPp2 grant funding, the cost of the turbine itself is fixed in the contract between BERR and the Framework Supplier, which itself was the result of an open market tender. The Framework Supplier cannot exceed these prices for the turbine. The groundworks elements on the job were tendered.
The costs of the scheme had to be verified as being appropriate good value by BRE as part of the LCBPp2 grant approval process.
Accordingly, it is safe to conclude that the project price represented everything bar a rip off. If you take the Iskra price out of the overall contract costs it probably was half the price.