Suttons sell seed potatoes

Thompson
& Morgan also sell seed potatoes

Using these special bags called Grow-Pod it’s easy. They are made from a fine weave of hard-wearing, rot-proof polypropylene with lots of integral drainage holes plus they have 2 strong handles for easy carrying make them easy to move about on your patio.
You put the potatoes in at the bottom in a few inches of compost and gradually fill the tubs keep covering the foliage up until the bags are full.
Remember to water regularly too! Potatoes need plenty of water for even growth.

The potatoes you get are:
RED DUKE OF YORK
early cropping, nutty flavour, attractive smooth red skin makes it easy to ‘scrape’

CHARLOTTE
second early cropping, wonderful succulent flesh, waxy texture, delicious eaten hot, or cold in salads

YUKON GOLD
early main crop, yellow skin, golden flesh, good as bakers and for mash

REMBRANDT
main crop, yellow skin, cream flesh, gorgeous taste, good for chips and roasting

And don’t forget the bags are reusable so year after year you can grow potatoes at home. Loads of places sell seed potatoes too so you don’t have to worry about that!
You can also try more unusual types that you don’t get in the supermarkets too. That’s one of the nice things about your growing your own veg!
You also avoid any problems with diseases in the soul by growing in this way.