FF
but orbiting is not a dangerous manoeuvre if the a/c behind is actually using his eyes
Ok, so let me run this scenario by you:
PA28 throws in a self initiated orbit, putting him head to head with the Beech 200 / Citation / Faster twin who is bearing down him. What options does that give the faster traffic who has been passed the traffic information and has fully accepted that they will have to extend downwind. Said trafic now has to take avoiding action in the circuit and possibly files an AIRPROX through the manoeuvere done by the orbiting traffic. By the time you tell ATC you're doing it the damage has been done.
Still think it's not dangerous? Just by saying you're going to do it doesn't make it right - it is potentially lethal.
So - I will re-iterate this again for the benefit of those that have not got the message:
Pilots should NOT self initiate orbits in the circuit 
CM