https://www.doncasterfreepress.co.uk/news/packed-passenger-plane-nearly-hits-drone-at-doncaster-airport-1-9352752

Disgusting flying by Drone Pilot. Hope they get charged.

The problem is that there are very many more drones in the UK than sensible operators. A lot of operators will have no idea they have done anything wrong  and a large number of that group won't care either.  Also as drones don't have  electronic identifiers no one will know whose drone it is  and once it has dropped below radar (if in deed it is visible to radar) no way of following it home.

Regulations are slowly coming in where all drones will have to be registered but it will be many many years before there are no unregistered drones still able to fly.  There are still  un taxed and uninsured cars on UK roads despite that being illegal for many decades.