Bike thieves, Gumtree, and retrieving one's possessions

Isn't the whole point of having a Brompton to be able to fold it up and take it with you, thereby eliminating the possibility of theft?

This is what I have been trying not to say all along! (It would probably be considered insensitive.) He locked it up on the South Bank, went to have a drink, and when he came back it was gone.

I spoke to him earlier, and he's more-or-less decided just to let it go, and get a new one on the insurance. Which is a shame, because I've always wanted a chance to get one over on the bike thieves!