Feel stupid now, I have it sorted. what happened was that I opened a new game to experiment with something entirely differant, went and had a beer, came back remembering that I had completed that research but forgot I was not in my actual game.
Like I said I feel a little silly.
I have another question but it is not related and I cannot find anything about it using search so I'll open another topic.
If a Mod would like to delete this topic, would be good