I suppose when it comes to merging groups, obviously a whole heap of factors need to be looked at.
Obviously, geographical proximity is one - that one is fairly obvious. There are some brigades around who are on the outer edge of a group area. The population of that township tends to associate with the adjoining group - eg the kids go to school in the adjoining group area, townsfolk do their shopping in the adjoining group area, collect their mail from a post office in the adjoining group's area - so it makes sense to add this group to the adjoining one!!
However geographical area should not be the only criteria.
We could go down the track of all groups to have roughly equal numbers of brigades in them...but, you could end up with the same sized groups, but one does mega numbers of calls per year, the adjoining group hardly any, so one group has group officer holders getting flogged with work, the adjoining ones not doing a lot!!
So, do you then look at rearranging group boundaries based on workload - so that each group ends up with about the same workload...so some groups would have a handful of brigades, others very large, but roughly the same workload...?
These suggestions make it very simplistic, and obviously, changing / rearranging groups is not that simple.....especially when tribalism & politics gets involved!!
However, I do believe it is time we seriously looked at the issue, and made some changes to groups and group boundaries.... after all, the bulk of our group boundaries are still based on which council area you were in!!
Pip