This year I'm experimenting with getting more seed potatoes from a bag of tubers by cutting in half a couple of tubers of each variety that I'm growing (Home Guard, Charlotte and Cara). I'm aiming to get decent sprouts on each half and will let the wound heal and then plant out as normal. I'll mark the row and see how they do compared to the tubers I'm planting whole.
I'm interested to see if any rot while healing and whether you get a larger or smaller yield or bigger tubers or just more but smaller ones.
I'm also holding back a few Charlotte tubers to plant in August, hoping for a crop of new potatoes on December 25th. But I'll make sure I've buried some from the summer harvest in a sealed bag filled with sand just to make sure I have this Christmas treat whatever happens to the late sown crop.