Better info on Wikipedia
Often I find better info about episodes on Wikipedia, especially for lesser known shows. A good example is for "Come Dine With Me". This is not only for information but also for episode ordering and existence.
Is it not possible to get the information from Wikipedia Episodes also or somehow compare to TVDB information.
Unfortunately not possible to use Wikipedia as a data source. However, TVDB is an open database so anyone can register over there to add or update info.