Crop type training/validation samples

Dear all,
I am doing identification of winter wheat in European and need the winter wheat distribution map in each European country. It is a pity that I could not find a type map or sampling point data of a particular crop in a particular area.
Fortunately, I learn that sen-2 agri team have for sure training/validation samples for many study areas in Europe. I hope I could get some training/validation samples of winter wheat from your team.

Best regards!
Jingjing Wang