KitKat: is there a hyphen or not? York, the chocolate city, weighs in.

From York, where they've made KitKat since the Rowntree's days, the whole city ran on chocolate, my nan worked the factory. So I of all people should know how it's written. Kit-Kat. With a hyphen, Kit dash Kat. That's how I see it in my head, that's how I'd write it. Look at a wrapper. No hyphen. K……