Peter wrote:
and removing an aircraft cover is likely to be hazardous there
Just make it so that aircraft with covers on, are not towed out of the hangar by the firemen, but remain stuck in the hangar.
Not ideal since the apron is much more windy, and removing an aircraft cover is likely to be hazardous there. It could be literally hazardous if it gets blown into someone’s prop.
the owners may not be happy about getting charged the apron parking rate Whereas moving the plane out and not turning up and not saying anything, has a zero cost.
Moving aircraft (always) to the paid parking area after extraction from the hangar sounds to me like a valid solution in terms of preventing that behavior. If they don’t show up they pay let’s say 24 hrs outside parking.
if the fire brigade had a motorized tug/tow they could easily bring the planes all the way to the apron
They do, but the owners may not be happy about getting charged the apron parking rate 
Whereas moving the plane out and not turning up and not saying anything, has a zero cost.
The problem IMO is not people in GA, it is people full stop. You will see behaviours like that everywhere.
On a different note, in your case if the fire brigade had a motorized tug/tow they could easily bring the planes all the way to the apron, that could probably be a good solution.
Peter wrote:
The price to pay is generally little or no winter flying, due to waterlogged grass
This is also “waterlogged grass” 
‘Winter-waterlogged’ folks should look at getting one these nice new UL-helicopters
Probably this atmosphere is most present in the UL/experimental/lighter cert GA scene.
Yes; many annex 1 people have moved off the “standard airfields” and went to farm strips. People work together a lot more there.
The price to pay is generally little or no winter flying, due to waterlogged grass. I’ve looked at this too, but I fly a lot in the winter.
Anyway, this is a detail; my point was how many people involved in GA don’t seem to give a toss about others. Not surprising really to anyone who has been in GA for years, and it explains a lot.
Depends on the setting. Here on the island, the local fields are a centre of camaraderie. Everyone knows each other, helps each other and most are close friends to do joint flying outings with. I’m pretty sure there are many such little communities throughout Europe. Maybe it’s even the majority? Probably this atmosphere is most present in the UL/experimental/lighter cert GA scene.
Where I am, the fire crew are very good, but if somebody does what I mentioned, it still gets your plane stuck for an hour extra, and there isn’t much they can do.
The overall system is much better than what I had for some years where it was a maintenance company, closed at weekends, so it was a DIY job, and frequently some dick would leave a plane locked and with the brakes on Often a twin…
