Heard yesterday from a colleague that there is an international group of journo's doing research into the grey charter market. They have pulled a years worth of flight data from euro control. And apparently it obvious which airframes are doing it and which pilots. And its not just a UK thing. And we are talking three figure numbers of flights per week inside EASA area.
He was picked up because he ferried an empty aircraft back to Germany on his CPL last year before he started doing multicrew job . Its not just N reg which is involved.