Chicory - I'm confused

Last year I grew the mixed leaf chicory from Franchi.  I preferred some to others so will grow separate varieties this year.  I have noticed a couple of red ones (luckily one of the ones I really liked) have started to shoot again.  I dug one up and there were three or four smaller ones growing off the main stem. 

My questions are:

It looks like the radiccio you get in the supermarket salad bags, any idea what it is called?

Shall I break the shoots off and grow them all separately.  If this is the case can I treat it as a perennial and do the same next year?

Could I force this in the winter like Witloof, I can't find any reference to a raddiccio suitable for forcing.

Many thanks
Ali

I have seen pictures of red chicory forcing exactly like witloof types, but maddeningly the book didn't give the variety!  Maybe I should save a few roots to experiment with next winter.

Many thanks for the helpful replies, i'll experiment with the treviso tardiva and see what happens.

Ali