Just had a quick look on the site but it seems a bit difficult to find out anything about the "D" s, you have got to do alot of searches to find anything of interest.
Too much work for too little information if you want my view.

Ok if you are interested in every evolution of Corsa ever made.

 

yeah i joined but rarely look in there ... it's over crowded for my likes .... nice if you own earlier model.

 

too aimed at the earlier models...have had a quick browse though!