DS12 is getting an expensive (about £350) bike for his birthday. He is often out and about with his friends on their bikes and whilst they do lock them up if they go inside shops etc but I am worried about someone taking it off him. There have been a few cases of older teens and even adults taking kids bikes and scooters. I want to insure the bike so I can tell DS if anyone does this to just let them take it and not try to fight them because I'd rather have no bike than a stabbed son. BUT all the insurance policies I have seen state they insure against theft if the bike is properly secured so how do I insure against theft when it is actually being used?