These three characters, Louis the Mage, Major Karl Dietrich and Phillipe the Apprentice Mage came from the Vengeance of the Vampire diorama which appeared at Games Day UK in 1999.
Major Karl Dietrich was converted by Alex Hedstrom and painted by Martin Footit, but I can't find the credits for the other two in any of the shots in UK WD243. All are conversions by the GW UK Studio.
If you have shots of them (or a copy of the event programme) I'd like to see them in order to repair the banners. I rebased them.