Keith Floyd was hardly the first of any genre. There had already been other people with cookery shows and there had already been other drunks on TV.
Oh I didn't realize there was a special sub genre of tv cooking show that had just been made up.If you are talking about the ABC steps to cooking and baking with some Mumsey type in her country kitchen, then yes there were cookery programmes before Keith Floyd.
If you want to talk about raw, fresh, unique, entertaining, non-studio based production then Yes Keith was first of his genre. He even cursed long before Ramsey learned how to cook!