Shy Tourque is quite correct. It was designed as a way to avoid being shot down in the circuit.
You have to admit it works, how many harvards and jet provost have been shot down at North Weald in the last 50 years. Just a pity that others who try to do a standard join (Note the phraseology here, STANDARD join) have to put up with these pratts playing war.
Oh, if the argument starts to go against you, don't worry, just ask the moderators to close down this thread as you are bored with it.
Come come come. There can be NO justification for such a maneuver.