Also as well I suspect alot of flights don't really have an objective in that yes you may set out to a destination but may go somewhere else in the end. I suspect most pilots who start out doing the good thing and do this once and have to deal with all the fall out then don't bother again.
Yep 2 sheds which is why I said the above. They get side tracked or don't get a crossing clearance or experence more head wind than they expect and then discover a huge fuss when they they do eventually arrive and don't bother again.
Up north it doesn't happen so much I suspect the first port of call is scottish info who most of us use. Should imagine down south with the multitude of different service which it possible to speak to it might be a bit of a pain to track the aircraft down. I susppose if it has a mode S it might make life easier.