I’ve added the Watch Constabulary’s (and OIP’s) special rank titles for the E- and lower O-grades to the Table of Ranks, for those interested in such things. See them here:
table of ranks
Rank Structure
Since I needed to type up an exportable version anyway for a comment response, I thought I might as well share the Table of Ranks of the Imperial Service and Imperial Military Service with everyone.
It’s in this spreadsheet, since WordPress doesn’t give me a good way to do tables.