In our case, I believe, yes fees would be charged.
Like all other major UK airports, we pay the local Police for the work that they do; many millions a year. So, ultimately, it's all the other passengers using the airport who pay. This seems entirely correct to me; it's chance as to which individual a/c or pax. need help where, but taken overall over the years things should even out.
I just wish other means of mass transport were required to pay their way. If we demanded that of the railways, they'd shut tomorrow (or about 1922 actually!)
Cheers,
The Odd One