From what I understand, if it popped out in normal use it should be covered under warranty or fairly cheap to fix if not. The bad news is that you can't get the key that matches the ignition so you will have to tote two keys at all times if you want to have access to it.
I don't know why Triumph doesn't have key codes so you can replace damaged parts with matching keys. That's what I've heard anyway.
If someone know otherwise please correct me if I'm wrong about this. (Kinda hope I am or that T has changed their process.)