US Brompton models are shipped to a US standard - front brake on left. I would guess your Moulton slips under some limited volume 'custom' loophole.
I personally switch all my bikes to front brake on right as I'm a motorcyclist. The Brompton was a bit of a pain as you need to rethread the cable.
Last edited by reppans; 07-26-17 at 09:44 AM.