Hawk37
Many thanks for the reference to the FARs !!
On a the quick read through it does seem that the circuit altitude in USA Class D airspace is 1500 above airport elevation for large/turbojet aircraft. It also seems that 91.129 is applicable in Class C and B airspace.
Good info and thanks for pointing me in the correct direction. I want to do some more digging and will get back to the thread when I have finished.
best regards,
Bruce Waddington