I just came across this lovely website (available in 9 languages):
They have a whole bunch of educational films on ‘ABC OF SEED PRODUCTION: TECHNICAL AND THEORETICAL TOOLS’
Here’s an example of their video for chicory:
Of course they also tell us how far apart varieties need to be, though for us I suppose that means the further the separation distance they say, the better for us as they’ll cross even more when we plant them together
Other links to various website for crop guides can be found on this page - this is an English website: