Whilst I like the idea of a lighter Brompton, I have to take a reality check. Mine rides around with a front bag stuffed full of work stuff and my lunch, a litre of water, and a whopping great armoured cable lock for the potential occasion where I can't have it sitting beside me; and a saddlebag that has the Brompton cover, a battery headlamp (for deployment when it gets dark), a can of tyre sealant for emergency puncture repairs, a multitool, and emergency fuel supplies for the engine. Saving a few grams on the bike isn't going to make a big difference - fortunately I never need to carry it very far.