Formation lead changes
An odd question perhaps but I can't find the answer in AP3456....
If, on a training sortie (a 2 ship), you brief a lead change half way round a low level route, would you then renumber the formation from that point or would you continue the rest of the sortie with "XXX 2" in the lead position? Similarly, as an ATC'er receiving a 2 ship for a stream landing, would you expect callsign "XXX 2" to land before or after "XXX 1"?