"Great Detectives Poirot And Marple" as known as "Agatha Christie no Meitantei Poirot to Marple" is not licensed. (source: ANN and animenfo)
I think the reason why it is removed because it does not get many attention from members. If you said that it was here last week, then most probably it is removed due to lack of interest of members.
You may ask for it to be re-hosted, but the chance is small, unless there are many other members that wish for this anime to be re-hosted.
Other choice is to follow doofus123's second link, which will lead you to Anime/Manga request thread, and ask your request there.