The Tigers were made and were distributed to US dealers, they never made it in to the UK. The original planned production was for 30 of the grey Tigers, 100 each of the winter (311) and Kursk summer (842) and 75 each of the 2 DAK Tigers. A good quantity were made, but I don't know if the full production run was completed. They are directly comparable in size to the older K&C Tigers (WS43 and WS70) and are of similar sculpting style (albeit, being an earlier version of the Tiger). The commander figures that came with them were not brilliant and were 1/32 at best.
The Pak 40s were shown at the London show in several versions, but never reached production. 3 versions were planned (Summer Normandy, Winter and DAK) and there were some interesting ideas for the crews, but they never made it before NMA closed. The Marder III, wasn't released, although they made it as far as show prototypes, and the Marder II, again, was only a prototype (although I managed to get hold of one - I presume, one of the prototypes brought in to the UK for NMA approval).
I suspect that as a result of this, the web site listed is outdated as I'm pretty sure none of the Pak's or Marders ever made it out.
Simon