This has now happened to 2 of my mates in the last week or so.
1 was going into SOU and the other was going into LGW.
For me, it seems as though the entire situation is getting a little bit out of hand here - we as pilots can only ever report when we've seen one, but I somehow doubt that the guilty parties will ever be caught as the area it's coming from can be so large.
But really, in my humble opinion, this is rapidly turning into a major problem.