I have been rapping by head of late trying to find a way to attach a u-lock to my Brompton when I am cycling and when I am not using the bike. There is absolutely no space available on the frame to attach without affecting the fold. The current option is to carry the lock in a bag which is a pain as my u-lock weighs 2kg and I fear sometime I will forget to bring it with me.
I use a u-lock as i believe they are the best deterrent to potential thieves and I do need to lock my bike on the street sometimes.
Has anybody thought up of a solution for this problem, we need a new invention, someway of incorporating the lock into a frame?