Not from AHB, but last time I spoke to the Head of AHB about this - God only knows why it came up in the conversation - there might have been some confusion over 43's continuous service, since it appeared further down on the seniority list (at the time, about 12-18 months ago) than might have been expected; there was a possibility that some sums had gone awry. The figures f4 offers suggest there might have been a bit of recalculation going on, since they look a bit more akin to what would be expected.
The problem for 43 is that unless 23 and 25 are assigned somewhere else, the numberplate policy means that assuming 1(F) is the next Typhoon unit to form to meet the policy regarding seniority in assigning numberplates, 25 should be the next to form. 25 and 23 both have Scottish connections as well - albeit not as long standing as 43's - and I would imagine that it could be difficult to justify the Scottish connection to trump the numberplate policy relating to seniority, although it wouldn't be impossible.