Remember the days when we couldn't have roast or jacket potatoes in the summer because only little new potatoes were available?
Chip shops had to import potatoes from Cyprus to make chips and they didn't taste the same.
No little new potatoes available in autumn and winter, either.
Now we can get British baking potatoes all year round; same with 'new' potatoes and big 'old' potatoes for roasting, chipping and mashing.
I have no idea what they do with them, so I googled and found this:
http://www.potato.org.uk/crop-storage