I'm not really sure what you mean. Even if you're going to boil a pot of water, it's much quicker and energy efficient to boil in an electric kettle first and then pour that water into the pot, repeating until full. (Unless heating slowly is necessary, which I think is the case for boiled eggs?)

If you're only going to drink a single mug of tea then the kettle is actually horribly wasteful. It's better to microwave a single mug.

I also don't really understand the allegation that the English don't cook. Surely they're making macaroni and ketchup at the very least. Or why the English are relevant to the conversation at all.