Allotments 4 All

This plant was featured on Gardeners World about 17th Dec. Monty Don had it in his shade garden.  I have been trying every since to find a supplier on the web but to no avail.  :(   It can't be grown from seed - or, at least, does not come true. Does anyone have this plant? If so, where did you get it from please?  Or, have you a small piece I could have and I will send seeds of your choice or something from my garden.