In the mid eighties Citadel produced a couple of different ranges of Robots, Slocombe's Warbots and the Limited Edition SFD Giant Robots. They also experimented with some Manga Robots that were never released.
Robots
Slocombe's Warbots
SFD Giant Robots
Unreleased Manga Robot
Iron Claw Ork Megabot & Roborgs
Rogue Trader 4009 Imperial Robots
Reaver Class Battle Titan
Oldhammer Robot