Use real potatoes like King Edwards. Peel them and chip them Fat.
Make sure your fat is as hot as you can safely get it and sling 1 chip in. If the fat don't go mental it's not hot enouth and wait. Try again, once you get the mental reaction then put chips in carefully.
Leave them to go mental and only move basket about once or twice don't go stirring or messing with them.
Open a newspaper centre spread, take chips out shake like a mad man and Throw them on the newspaper, kitchen towel if you are a Wooooss.
Then cover them in Vinegar and Salt.
Good chips don't need anything more than Salt and Vinegar on them. Any chips that need ketchup are crap.