Originally Posted by PhilH
Seriously, I can't think of anything to worry about.
Exactly. Who on earth is going to steal BA Miles?
They have to have tickets issued in the name of their passport, there's going to be a delay between purchasing the tickets (having the miles come out of the account) and travel, and if fraud is detected it's very easy to find cctv of the fraudster and know where they're going to be (ie on a plane on a certain date!).