Ah, it wouldn't cross my mind to lock my luggage/bike in a train. Then again it is obvious what it is and easy to walk away with it so I suppose I could do that. I don't think I've got time for a trip to IKEA so would sew something together quickly if I had to wrap it.
So I have a Brompton and I will take it on the Eurostar on Wednesday. Do I need to wrap it in anything?