That site is fairly good, Rudi, but it is specific to one English county and although they try to cover a fairly wide range of subjects, including descriptions, they are obviously limited for available space.
I use Wild About Britain. There are a few other more specific sites but you usually can't ask questions or get specific advice; like on WAB.
For Belgium there is a Commanster site which is quite good, but once again just looking at images. I will see if I can find the link.
Incidentally, I found one of those craneflies today.
I'm thinking about Ptychopterid contaminata but not really sure. It is a male but I can't fully understand the genitalia from that angle.
It was in deep shadow so I had to 'flash out' some detail. Just two shots then it was gone.