Like most here, I’ve had the worst time trying to renew my Italian passport. Though I’ve finally managed to to make the appointment. There’s a lot information floating about, though it’s difficult to get strait forward advice and help. This forum has helped a little and I’d like to share what I’ve found to be the path to getting that appointment through the consulate.

1- Register on the Prenota website. (Even though you don’t really use it, it has to be done)
2- Register with AIRE through the conslondra.esteri.it
Type in search “how to register AIRE.”
3- You will need a printer and scanner when you fill out the online form. There’s a declaration you need to print, sign and scan with 2 other documents. Passport and proof of residence.
4- Contrary to what a lot of people are saying here, there is NO waiting time for AIRE to accept your registration. It is done instantly through the portal registration. You receive an email saying your registered.
5- Here comes the pain. Call the passport office. They open at 8:15 mon-fri. Start calling at 8:14 if you’re not on the queue by 8:17 you will be on hold for over an hour easily! I wouldn’t bother till the following day once it went past that time.
6- Get familiar with the automated message when you call. It’s first in Italian then English. Learn the message so you know when to hang up and call again immediately!

Once through and you’ve done the procedure correctly it’s easy. I got an appointment within a month in London.

Good luck, it’s the worst administrative experience Ive had in a long time. I was trying for close to a month going round in circles then giving up and starting again.