Unreleased Rogue Trader era adventurers and a mystery solved (Bryan Ansell collection)

There's a mystery that's been bugging me and fellow Citadel collectors and Rogue Trader enthusiasts for some time: who and what is the figure on the top left of the image on p. 11 of the Rogue Trader rulebook? Is it even a Citadel figure?

Unreleased Citadel Rogue Trader era Adeptus Arbites in the Bryan Ansell collection

It's not unusual for images of previously unseen unreleased Games Workshop figures to appear on the internet, and probably the best overall source for these is the Collecting Citadel Miniatures wiki. What is unusual, however, is for new figures to appear in older ranges that might previously have been considered to be completely documented; I recently discovered two figures in Bryan Ansell's collection that fit this criteria.

The figures below are labelled "Arbites" on the front of the tab and "GW 1987" on the rear of the tab. So here I present two unreleased Adeptus Arbites from the Rogue Trader era: