Unfortunately the PSNI in Northern Ireland won't reveal how much it costs to keep their helicopter on the Tarmac for most of the day
I did however get this strange reply from them
1/ Given that Premair are sub-contracted by the PSNI to provide Pilotage services for the PSNI Helicopter could you tell me how many pilot man hours are provided to the PSNI by Premair per annum ?
Reply from the PSNI
A contractor provides PSNI with pilots to cover 2 shifts, 7 days per week, 52 weeks of the year. 
So its now with the ICO 