Squadron numbers
Taken from a signal released some years ago explaining the rationale behind sqn numbering.
...they took into account a number of considerations. First, the principle of seniority should apply in the allocation of numberplates. However, there should be no general attempt to re-number in service squadrons to keep the most historically senior numberplates in service. Thus, a squadron which is not subject to any change of role, type or location should retain its current numberplate. It was also agreed that priority should be given to the re-allocation of live numberplates of squadrons with a particular significant or distinguished war record. Finally, note should be taken of squadron historical association with a particular role. Against this background, the ...
There then follows detail of some renumbering.
Does that help anyone?