EU, use the official results of the vote as the official Article 50 notification. Was the question not clear? Yes, it was. Were the results not official? Yes, they were. Were you not notified? Yes, we were. Is Cameron not a jagoff? Makes us puke.
So, screw Cameron. Get an official, certified copy of the referendum results and use that as the official, written, Article 50 notification. What is Cameron's recourse? Sue? Let him knock himself out and take it to the EU Court. Cameron has made himself and the UK a world laughing stock. If you tie yourself in knots over what an Article 50 notification is you will be a world laughing stock.
So, screw Cameron. Get an official, certified copy of the referendum results and use that as the official, written, Article 50 notification. What is Cameron's recourse? Sue? Let him knock himself out and take it to the EU Court. Cameron has made himself and the UK a world laughing stock. If you tie yourself in knots over what an Article 50 notification is you will be a world laughing stock.