Rattle : lets make some assumptions:
1) Aircraft will be at ground idle
2) Approx fuel usage 110 kg per hour
At the approximate current costs for fuel ( as the aircraft is not airbourne and not clocking up flying and thus maintenance) I make the cost to the besiged British tax payer just under £15 + VAT.
Wow
I am sorry to hear about the noise, however in my opinion the crew of the aircraft will be carrying out detailed necessary filming for the subsequent inquiry.