Not that you'd ever be given a Kit Kat to eat in a formal dining setting, but if you are etiquette expert Lucy Challenger has made a video explaining the correct way to do it.
“I'm going to show you the formal British way to eat a Kit Kat." she says.
Basically: Small, delicate bites.
That looks like it would take AGES to eat one piece of a Kit Kat. I'll just eat it in two bites in the comfort of my own home, thank you.