Apologies for jumping into this thread late.
A couple of years ago I observed a cost sharing flight arrive from France and offload passengers. The ac had caught my attention when it descended into the airfield through very low cloud and missed the runway. I challenged the pilot and untimely filed an MOR.
Diane Park took the cause up as the pilot, an FAA PPL had been prosecuted twice before (and fined in magistrates court)for illegal commercial flights. The inference was the CAA can not seem to find a way to stop him. The CAA dropped the case started by my MOR due to the "expensive legal support given to the pilot by his friends".
Since then we have seen other cost sharing schemes try to use the airfield and have banned Wingly flights as a result. I just hope that the CAA will have more teeth to tackle this activity.