looking at seed potatoes - Marabel?

 I am looking at what potatoes to plant next year, one of them is Marabel but I cannot seem to find them as seed potatoes.  My other choices are Desiree and Maris piper. Does anyone know where I can get some Marabel seed potatoes?

could I chit the ones from the supermarket?

that is exactly the link I was looking for thanks!!! so it is just risk of disease then, mmmm cant get marabel seed pots tho mmm. food for thought as it where...