My understanding is no-one owns the airspace. If it’s UK airspace, it’s controlled by the CAA (Civil Aviation authority).
Unless it is marked as a NFZ / prison etc anyone can fly over it within the drone rules ie. Max 120m AGL.
However, you...
I can't speak for the UK, though I suspect your laws are similar. In the US, it is legal, at least for now, to fly over privately owned property. However, the property owner has the right to prohibit you from taking off and landing on their...