Barge, years ago when I used a kettle element it was from a SS kettle and one whole side of it was the earth connection as it was tightened into place. Double insulated appliances even if they have a three pronged plug usually don't have a wire running through them and most have only two prongs. If the person in the pic has put a washer on both sides of that pot it wont be earthed. The elements the home brew shops sell for people to install themselves only have one washer to seal the fitting the other side is the earth. Like people are saying an unearthed setup will work fine until a fault rears up, and with cheap elements in kettles getting cheaper and cheaper in quality these days it will probably be sooner than later. Running a ss bolt through the pot and fitting a tab on the earth wire to fit on it would be a better idea.
