Sorry for being so dull but am I missing a trick here. I am not even going to discuss the use of scanners as it has been done to death here before.
If the airport was open for an IFR (or whatever) inbound then the helicopter was not using an extension for him/her, merely landing at an airfield that was still open. Provided any PPR etc conditiions were met then IMHO the charge of almost 200 quid was outrageous. Surely the normal landing, parking fees etc would suffice- afer all an open airfield is an open airfiels as all the required safety services were in place for the IFR (...) inbound. Now if the IFR was about to shut down and thus the airfield was closing it is another matter but ........ I think business is coming in the way of common sense and the overriding desire to provide a service and help someone out. Whatever happened to the goodness of human nature; and before anyone calls me naive, would it have really hurt to let the rotary land without the extra cost. What goes around comes around.