Grow your own seed potatoes?

I've planted up some left over spuds from a load we got from our friends field last year, variety unknown but they taste great and are suitable for boiling, roasting, baking and make great chips, I think they are a Cara / Cara cross. I know it's inadvisable BUT I am growing them to produce seed potatoes for next year, the problem is, I haven't a clue how to grow "seed" potatoes..... HELP!

 

Vince just grow then and eat them, then buy seed of Cara next year.

Seed potatoes as far as I know are grown mostly in controlled enviroments to avoid passing on disease, so yours could be building up diseases by replanting your own.

 

The risk is that yours have disease, dormant within the tubers. If that's the case then once they have grown they will succumb to the disease, and spread it to the surrounding area ...

Much better to grow Potatoes from certified disease free seed tubers - after all ... they aren't expensive