I know that this subject has been debated to death before, but I have some sympathy for Heathrow Director's comment, particularly as Sarah123 might not be aware of the niceties.
Yes, I know that numerous people use airband scanners, but as long as they are not using the information gleaned for any other purpose, they are tolerated as being harmless. However, as soon as that information is utilised or publicised, that is a different matter. I hardly think anyone will get excited about this, Sarah, BUT I would not be too impressed if I were the controller or helicopter pilot concerned at having what is, in effect, my private conversation printed in public. Consider this...if ATC were conducted with telephones and cables, it would be highly illegal to tap into the verbal exchanges. Also, whatever you might do for a living, would you be very impressed if any member of the public were permitted to monitor your every word and action and then publish such information with their own, perhaps ill-informed, comments?
On the specific point you raise, in the case of an extension beyond the normal, published hours of operation, this costs money! - for staff in various departments, electricity, water, toilet cleaning PLUS the airport is in business to make a profit. Are you suggesting that the commercial operator should bear the whole cost of the extension and the helicopter operator contribute nothing? If anyone can afford to / needs to operate a Jet Ranger, I think they can afford a mere 150 quid - or, of course, they could flight plan accurately and check the hours of operation.